Free online surfing on the campus, communication and exchange anytime, anywhere, and convenient and quick access to knowledge, such an online experience is a dream for every teacher and student. Technological advancement promotes continuous changes in the way people live, work, and learn. Today, with the rapid development of science and technology and continuous innovation, the dream campus network experience has become a reality. In recent years, with the continuous decrease in the manufacturing cost of key chips for WLAN products and notebook computers, portable computers with WIFI function and other WIFI terminals have become widespread. The number of people holding WIFI terminals in various educational institutions such as vocational schools and universities has increased year by year, and the office, teaching and personal computers of students and teachers have gradually transitioned from desktop computers to laptop computers. At the same time, due to the limitation of access location and access conditions, the network access method based on the traditional wired connection has been difficult to meet the constant pursuit of high-quality learning, working and living conditions for teachers and students. Conversely, wireless networks are favored by teachers and students for their flexibility, efficiency, and freedom of movement. They have become the mainstream of the construction of modern campus networks and will help accelerate the continuous and rapid development of education informatization in China. For more information, please log in to the electronic enthusiast website (http: //)
Wireless network deployment adds value to campus network services
1. Mobility and scalability
Wherever you go and where you use it, it is only for basic needs. Keeping the information transmitted and connected with the network at all times makes the personal computer no longer just a mobile orphan, but the inconveniences and limitations brought by the network line are difficult to overcome It is necessary to rely on wireless communication. Therefore, the wireless local area network WLAN has brought considerable mobility to the computer, and has completely subverted the traditional life and working state.
One of the benefits of wireless local area network WLAN also includes its flexibility and convenience. Because it does not require a large amount of wiring, it is more convenient to install than a traditional network, and pipelines are rarely needed to erect network cables. For network administrators, not only can the network construction time be greatly reduced, but if the network topology needs to be changed in the future There is no need to redraw the cable too much. In this case, because the WLAN replaces the copper wire or fiber optic cable with radio wave connection, it is much more convenient to adjust! Even if the desk is moved, there is no need to worry about the movement of the network cable jack, the information is It is as readily available as air, suitable for flexible planning and application by network administrators, and very attractive for commercial applications.
Another advantage of wireless local area network WLAN is good scalability. With the laying of the traditional cable network, the general network management is often used to prevent additional installation needs in the future, resulting in unnecessary waste during the initial installation. In terms of a WLAN under 2.4GHZ, if more users join the network, it can be expanded to three non-interfering wireless networks at the same fixed point. Therefore, WLAN can be large or small, and expansion and upgrade are more convenient than traditional wired networks. As long as the wireless access point AP is added, the coverage and capacity of the entire network can be expanded.
2. Expansion of WLAN teaching system
If you want you to arrange seats according to a specific teaching program; if you want to add students in a multimedia network classroom, then the wireless network solution can easily solve these problems. With a wireless network, there is no need to connect a PC to each Ethernet port with a network cable, so when you move a networked PC, it is as convenient as moving a desk to use the wireless network in the classroom, which people can carry With a personal laptop, roaming from one location to another area, no longer subject to the constraints and constraints of cables. In each classroom, teachers can bring notebooks and come to the students from the podium to provide explanations. Teachers from foreign schools who come to the classroom to listen to open classes can also access the Internet at any time and download related materials without having to go to the office area.
When conducting academic seminars in the leisure area or holding regular meetings in the conference room, the meeting time is very short, and the meeting place is very free. When you need to transfer data to each other, or access the Internet, use the internal wireless LAN to network at any time. The implementation is simple. You can directly interconnect and access the Internet to consult information, which greatly improves the efficiency of your work.
3. Collection of campus data and real-time information
With the wireless campus network, learning will become unconstrained. Students can bring laptops to classrooms or libraries, and the wired network ports in these places generally cannot meet the Internet needs of all students. Students can also easily check the information they just heard or the experimental results obtained on the Internet to find relevant materials for verification, without having to wait until the next time they go to the computer room. Now all comprehensive universities have established MBA majors. Because many courses offered by MBA are strongly integrated with reality, MBA students can make full use of the superiority of wireless campus network connection anytime, anywhere, and access information on the Internet. The significance of wireless network will be greater for them. There are many university MBA majors that even require that each student must be equipped with a laptop computer to facilitate teaching, homework, project discussions and pre-stage demonstrations. And the establishment of wireless campus network will make those old teaching contents more colorful.
4. Voice and video application of campus wireless network
Based on the wireless broadband network, other applications can be considered. For example, VoIP, which is within the range of a wireless local area network, can use wireless terminal devices that support the IEEE 802.11 protocol, such as mobile phones and PDAs, for voice communication. You can also use the wireless network for real-time outdoor video broadcast, completely free from the shackles of wire.
5. Students access information online
Through the deployment of wireless networks, the mobility of these mobile terminals is truly reflected. School basketball courts, outdoor rest benches, classrooms and any other places covered by wireless can be connected to the Internet and connected to anytime and anywhere through the wireless network. The school online library consults materials, and the school can send notification messages to each end user group. It truly realizes the convenience and flexibility that modern schools bring to students.
6. Humanized mobile point of sale
With the support of wireless networks, campus commercial facilities, on the playground or in the open space around the teaching building, mobile commercial networks can make up for the shortage of the sales department on the campus, and provide more humanized services for teachers and students. Students can also use campus cards for consumption and settlement. At the same time, consumption data can be settled in real time. The mobile business point not only greatly facilitates the consumption of teachers and students, but also provides additional income for the point of sale.
7. Wireless monitoring point anytime, anywhere
Where wireless networks are deployed, wireless cameras can be placed to monitor the area, making monitoring more flexible and eliminating the need for time-consuming and complicated installation of video, audio, and control lines. Including, it is possible to easily monitor and control some lively places in the school that need attention and prevention to prevent the occurrence of emergencies. Wireless cameras can also be erected in front of key locations such as the finance room and the principal's office to ensure safety at any time.
Campus network core requirements
1. Billing system
The campus network is an important platform for the school to communicate with the outside world, and an important stage to show the school's appearance. With the continuous improvement of school hardware and equipment, the complexity and diversity of users, there is a need for network security certification. The network needs to operate, so there is also a need for billing. It is very necessary for each school to choose a reasonable and effective authentication and billing system according to its own characteristics.
2. QOS system
The network centers of most colleges and universities are already playing the role of Internet service providers. They provide Internet intervention services for teachers, students, and administrative staff of the school. However, more and more high-bandwidth applications (ie, P2P networks, streaming video) are used in the network, making the bandwidth required for critical tasks (ie, distance teaching and research) unsatisfactory. At the same time, they also found that simply increasing the Internet The bandwidth of the export is in vain, so they must rely on flow control equipment to ensure their services.
3. Security of campus network
With the advent of the information society, the Internet is playing an increasingly important role in people ’s work, life and learning styles. The campus network is crucial for improving the quality of teaching in schools and promoting quality education centered on innovation. Important role. Due to the uniqueness of the network, namely its openness, internationality and freedom, users are faced with severe security, instability and other issues. As one of the school's important infrastructures, campus network directly affects the normal teaching and office activities on campus. How to ensure the security of campus network has become an unavoidable problem for all schools.
4. Stable and reliable operation
With the rapid development of network technology, WLAN-based campus office and Internet-based applications in universities, middle schools, and elementary schools are gradually increasing, which puts higher and higher requirements on the reliability of campus networks, and the core equipment in the network guarantees the campus The normal operation of the network is very important. If the reliability of the core network equipment is guaranteed, the reliability of the campus network is basically guaranteed.
5. Unified operation and management mechanism
Depending on the size of the school and the number and range of areas to be covered wirelessly, the number of wireless devices in the entire campus network will range from tens to hundreds, or even thousands. At the same time, due to the characteristics of wireless network deployment, the placement and environment of APs in the network are very complicated. Some are placed on indoor ceilings, walls, and desktops, and some are placed on outdoor light poles, exterior walls, and roofs. It is undoubtedly a very serious challenge for network administrators to manage such a large number of wireless network devices with such a wide distribution. In addition, how to organically and uniformly manage the wired and wireless network equipment in the entire campus network is also a problem faced by network administrators.
Challenges for large-scale deployment of wireless networks
Although teachers and students can easily get a quick and easy network application experience with the help of wireless campus network, building a full-coverage wireless network based on campus is undoubtedly a very challenging system project. With the expansion of the wireless network and the richness of its applications, we will face many challenges in the implementation of wireless projects. For the design of campus wireless network large-scale deployment. Implementation of equipment configuration. Equipment operation management. Later configuration changes System upgrade. Solution of various problems such as wireless network service association.
1 Challenges of RF planning and deployment
WLAN technology relies on radio waves as a carrier for data transmission. It is well known that the transmission process of radio waves is extremely susceptible to the surrounding environment. In different geographic and natural environments, its radio frequency characteristics are also very different. For example, different wall materials (or thicknesses) have different loss characteristics for wireless signals, and different spatial layouts have different reflections for wireless signals. On the other hand, because the radio frequency resources are very limited-in the 2.4 GHz frequency band used by the commonly used 802.11g, only three non-overlapping channels can be provided. This makes the wireless microcell deployment technology used in the campus network to implement a wide range of continuous WLAN coverage only 3 radio frequency channels to choose from. Therefore, when APs need to be intensively deployed to meet the access requirements of a large number of wireless users in academic lecture halls, multimedia classrooms, auditoriums, etc., we will have to carefully plan the radio frequency channels of each AP and adjust their RF power size. The above problems make the RF planning and deployment of traditional wireless engineering depend on professionals with rich wireless engineering experience to complete. The typical campus campus often spans a large geographic area, and the natural environment is more complicated. It will be more difficult to rely on traditional methods for wireless planning and deployment, and its workload and accuracy are also difficult to predict. Therefore, in order to make wireless networks truly deployable on campus, WLAN equipment vendors must develop a set of easy-to-operate tools or tools to guide engineering personnel in RF planning and equipment deployment.
2 Challenges of RF management
Radio waves are an invisible and invisible transmission medium. People usually cannot perceive changes in the wireless radio frequency environment without the help of professional instruments. For example, it is difficult to detect whether there are other non-802.11 devices operating in the 2.4GHz band in the network ( Temporary radio frequency interference caused by Bluetooth products or microwave ovens, etc.). In addition, when an AP in the network fails and loses its ability to work, a radio frequency coverage dead zone will appear in the area covered by it. When a new AP is added to the network, the wireless signal on the working channel of the new AP is likely to interfere with neighboring APs in the network. In the scenarios described above, if there is no effective means to find problems and provide guidance for solving the problems, then the management and maintenance of wireless networks will become extremely difficult, and it will definitely prevent school administrators from deploying Confidence in wireless networks.
3 Wireless network security challenges
Since radio waves have no visible form, they can be propagated and diffused by reflection, refraction, diffraction, etc. in addition to straight line propagation. It is often difficult to determine the accurate coverage of radio waves. Once the wireless network cannot provide sufficient security, within the effective coverage of the wireless signal, hackers and other bad intentions will easily access the campus network to damage the network or steal confidential information from the server. In addition, people with bad intentions can easily use technical means to intercept the application interaction process and content of wireless users in the network, thereby causing the leakage of important user information and leading to economic losses. As another option, bad intentions can also privately place APs within the wireless user signal reception range to deceive wireless users to access, so as to achieve the purpose of stealing important confidential data of users. The above situation tells us that whether it is in wireless network access, wireless user data communication, or wireless application environment, it is necessary to have a sufficiently strong security mechanism to ensure the overall security of the wireless network, which is also the wireless network can be used by school administrators Recognize and ultimately deploy the premise.
4 Challenges of device management
Depending on the size of the school and the number and range of areas to be covered wirelessly, the number of wireless devices in the entire campus network will range from tens to hundreds, or even thousands. At the same time, due to the characteristics of wireless network deployment, the placement and environment of APs in the network are very complicated. Some are placed on indoor ceilings, walls, and desktops, and some are placed on outdoor light poles, exterior walls, and roofs. It is undoubtedly a very serious challenge for network administrators to manage such a large number of wireless network devices with such a wide distribution. In addition, how to organically and uniformly manage the wired and wireless network equipment in the entire campus network is also a problem faced by network administrators. As an excellent network equipment supplier, it should be able to provide users with optimized network equipment management methods to effectively reduce the maintenance workload of network management personnel, improve the efficiency of network management, and reduce the recovery time of network failures.
Aotiandonglian comprehensive campus WLAN solution
Aotiandonglian is the industry's leading provider of integrated network equipment. It can provide users with an integrated campus network solution based on unified hardware platform, unified network management, unified user management, and unified security applications. AuteX AuteX series wireless controllers use advanced parallel multi-core multi-service processors and high-speed ASICs as business and data processing platforms, and are developed based on industry-leading intelligent distributed WLAN switching architecture. With the help of advanced software and hardware product design, Aotian Donglian Wireless Controller has powerful and flexible wireless user and Fit AP management features, supports up to 1024 FIT AP and 32K wireless user management capabilities, and provides network-wide 802.11n deployment capabilities , To meet the needs of wireless network deployment of campuses of different sizes. AuteU series AuteU series all-in-one switches are developed using industry-leading integrated fusion design concepts, with full-featured wired and wireless business capabilities. In addition to providing comprehensive Ethernet service processing capabilities, the AuteU series of products can also provide rich wireless network access and management features, and provide network solutions based on the integration of wired and wireless for various educational institutions to meet the needs of schools on wired networks. Smoothly expand the needs of wireless applications. In wireless endless access equipment, Aotiandonglian provides intelligent wireless access points that meet various application environments, working modes and access rates to meet the wireless coverage requirements in various environments on the school campus. In addition, Aotiandonglian also provides an optimized design of AuteView integrated wired and wireless network management system. Relying on the powerful management features provided by AuteView's leading software design concept, Aotiandonglian provides users with wireless network design and deployment, wireless radio frequency management and optimization, network fault location and troubleshooting, network performance monitoring and optimization, network security strategy And comprehensive network management solutions including management.
1 WYSIWYG RF planning and deployment
Aotiandonglian provides visual radio frequency planning and deployment tools. The tool will provide users with the most effective visual wireless network deployment and planning tools. By importing into the RF deployment tool the floor plan of each area that requires WLAN deployment and its area, expected coverage effect, obstacle material and other parameters, the RF deployment tool will comprehensively consider the RF characteristics of the three-dimensional space within the entire coverage area and automatically output each coverage area AP's optimal deployment location and predicted coverage effect. This will provide a strong reference for the actual deployment of WLAN networks, solve the RF planning and deployment problems faced by deploying full-coverage wireless campus networks, and help wireless network design and implementation personnel to quickly and accurately perform RF channel planning and RF power on the entire wireless network Identify and guide equipment placement.
2 RF management features that minimize labor costs
In response to the radio frequency management problems in the wireless network, Aotian Donglian provides visual intelligent RF management tools based on centralized (AuteView) or built-in wireless control devices. With the powerful functions provided by the management tool, Aotiandonglian wireless control equipment can timely find the black hole of radio frequency coverage caused by the failure of the access point in the wireless network, and coordinate the other APs around the failed AP through the optimized RF algorithm. Resources to complete the effective compensation for covering black holes. At the same time, the wireless control device can also discover the problems of radio frequency interference in the wireless network, and then use the optimized RF algorithm to coordinate the radio frequency channel resources of the entire network, so as to select a new available channel for the interfered AP. The new channel information will be automatically delivered to the interfered AP and executed to quickly solve the problem of radio frequency interference. When adding new APs to meet the coverage requirements in the existing wireless network, Aotian Donglian wireless control equipment can also automatically make decisions through the optimized RF algorithm and guide the new AP to complete the adjustment of the wireless channel and RF power. To achieve rapid deployment of wireless access points. The intelligent management features of Aotiandonglian can significantly improve the efficiency of network managers in the deployment and management of wireless networks.
3 Robust network security features
In order to provide schools with a strong and safe wireless campus network, Aotian Donglian provides strong and rich security features at all levels related to network security. In terms of user access security, Aotiandonglian provides 802.1x access authentication, PSK authentication, MAC access authentication, and portal authentication commonly used in campus networks. Through the organic combination of AAA server and wireless control equipment, Aotiandonglian can provide users with policy control based on user role, which includes the management and control of the user's QOS characteristics, application access rights and wireless roaming characteristics and other parameters. In terms of wireless user data security, Aotiandonglian provides strong wireless network encryption functions including WEP, WPA, WPA2 and WAPI to provide wireless users with different levels of data security to meet the data security requirements of various campus wireless network applications. Requirements. In terms of wireless network environment security, Aotiandonglian Intelligent Wireless Access Point can work in the mode of wireless access point and wireless monitor at the same time. At the same time, Aotiandonglian also provides perfect WIDS function to help network administrators discover and respond to the insecure factors such as Rogue AP and AD Hoc host in the network in time, and can effectively protect against DOS attacks in wireless networks. This provides a more complete and safer campus network application environment.
4 Network reliability and availability
The WLAN system adopting Aotian Donglian WLAN solution can disperse wireless users or terminals to nearby APs within the coverage of one AP. In this way, performance bottlenecks caused by too many user accesses of an AP can be avoided, and the performance of the network can be significantly improved and the availability of the WLAN network can be improved.
The CAPWAP tunnel communication between the AC device and the AP completes the centralized management and centralized configuration of the AP. The AC can fully automate the task of AP configuration and firmware upgrade operations to the AP. This greatly reduces the cost of operation and maintenance. In order to ensure the reliability of the WLAN system and prevent the service interruption caused by WLAN single point failure, AUTELAN AC provides WLAN DSR dynamic service and redundant backup technology. DSR is based on AUTELAN unlimited controller AC N + 1 backup technology .Finally achieve uninterrupted user services during handover. No re-authentication and accounting without interruption is transparent to AAA applications.
5 operable network to accelerate return on investment
In response to the practical demand for energy saving and environmental protection in the modern campus network, Aotiandonglian launched a full series of switches designed with unique environmental protection concepts. Thanks to the unique dynamic power management features of Aotiandonglian, this series of switches can automatically adjust the power supply according to various factors such as their own operating conditions, port working status, cable length and quality, etc. while maintaining performance without loss. , Which provides ultra-low power consumption reduced by about 30% compared with traditional Ethernet switches of the same type. At the same time, the access layer and aggregation layer switches based on noise-free design are more suitable for deployment in student and teacher apartments and other living places that require high environmental noise quality. This creates a quiet and harmonious operating environment for the school. With the help of a full range of environmentally friendly and energy-saving products, Aotiandonglian can create a green, environmentally friendly, economical and energy-saving wired and wireless integrated network operation solution for schools, and accelerate the return on investment of campus networks.
6 The most time-efficient network management tools
For wireless access points deployed in the network, Aotian Donglian provides centralized zero configuration management and control capabilities, allowing all access points to automatically discover and associate with control devices, and provides automatic configuration information and software versions of access points Update and upgrade. As a result, the maintenance workload of wireless access points by network management personnel is minimized. In order to solve the problem of power supply for wireless access point devices distributed in various complex environments faced by large-scale wireless network deployments, Aotiandonglian's full range of wireless access points provide Power over Ethernet (POE) support based on the 802.3af standard . As a result, schools can use POE power supply equipment to provide centralized power supply for widely distributed wireless access points, effectively solving the problem of power introduction when deploying wireless access points in various environments, improving deployment flexibility, reducing deployment time and reducing deployment cost. At the same time, by cooperating with Aotian Donglian's POE power supply switch, the network administrator can also realize remote detection or adjustment of the working status of the wireless access point and its power consumption. For every device deployed in the network, Aotian Donglian provides a visual Chinese and English WEB network management system built into the device. Based on this network management system, users can obtain the benefits of wired and wireless integrated network management based on a unified style and operating habits, which effectively helps network administrators complete the configuration and maintenance of equipment with the highest efficiency. In response to the centralized management needs of all devices in the entire network, Aotiandonglian provides AuteView, an intelligent network-integrated large-scale network management platform that fully integrates wired and wireless management capabilities. AuteView is a groundbreaking network management platform developed by the perfect fusion of wired and wireless network management features. In addition to providing users with completely consistent wired and wireless network management operations and full-featured wired and wireless management suites, it also provides comprehensive Network performance, event, log and trend analysis capabilities. With the help of AuteView's rich and powerful management and analysis features, network administrators can successfully complete the deployment, management and optimization of the overall network by simply operating a set of software. They can also quickly locate and help resolve faults in the network. This greatly simplifies the complexity of network maintenance and effectively reduces network operating costs.
7 WLAN forwarding architecture that seamlessly supports 802.11n evolution
All wireless control devices of Aotiandonglian are developed using industry-leading intelligent distributed WLAN switching architecture. This switching architecture is implemented by improving the unreasonable data forwarding mode in the traditional fully centralized WLAN switching technology and combining advanced software and hardware design concepts. In the traditional fully centralized WLAN switching technology, all data traffic must be concentrated at the WLAN switch or controller for unified data exchange. Therefore, when the service data traffic in the network is heavy, the pressure of the traditional WLAN switch or controller will increase sharply and become the bottleneck of the wireless network data exchange. The network is down. Currently, the fastest rate of mainstream WLAN access technology 802.11g is only 54M. Therefore, the performance problems in the traditional WLAN switching technology have not been fully exposed. In the near future, when the next-generation high-speed wireless network technology 802.11n is used in large scale, this problem in the traditional WLAN switching technology will become prominent and unable solve. 802.11n technology supports a maximum access rate of 600M, assuming that when a WLAN switch or controller has 200 802.11n APs, its WLAN switching capacity can reach 120G, which is far more than most current WLAN switching The highest processing capacity of the equipment. In response to the above problems, Aotiandonglian proposed the technical concept of intelligent distributed WLAN switching architecture. The core idea of ​​this technical concept is that user management data is separated from user forwarding data, and controlled data is separated from uncontrolled data forwarding. Data is separated from network business data. Different control strategies are adopted for different users, different data, and different services, and uncontrolled data traffic is directly forwarded in a local forwarding manner, while controlled data traffic needs to flow through a WLAN switch for processing. This greatly reduces the load on the WLAN switching equipment and prevents the WLAN switching equipment from becoming a bottleneck in the network. The use of Aotian Donglian integrated wireless campus network solution based on the intelligent distributed WLAN switching architecture technology concept can ensure the expansion of the network's future business and scale. And, it turns out that Aotian Donglian's WLAN solution based on intelligent distributed WLAN switching architecture will become the most feasible solution for the next generation wireless network (802.11n). This will greatly protect the school's network investment and reduce investment risks.
8 Software and hardware platform to meet multi-service integration
AuteX series wireless controllers are the full-featured wireless network control and management equipment delivered by Aotian Donglian for network operators. The full range of products uses advanced parallel multi-core multi-service processors and high-speed ASICs as business and data processing platforms, and is developed in conjunction with the AuteWare open operating system platform independently developed by Aotiandonglian. With the help of advanced hardware and software product design, AuteX series wireless controllers can provide high-performance Rich service features such as NAT, VPN, DPI-based application control, and bandwidth management. At the same time, AuteX series AuteX series wireless controllers also provide chip-level IPv6 service features, which can perform hardware-level high-speed forwarding of IPv6 data packets to accelerate various IPv6-based service processing capabilities. Based on an advanced hardware platform and an open software platform that is completely self-developed, Aotian Donglian can also provide flexible customized services according to the specific needs of the school to meet the school's increasingly rich business development needs.
9 Guarantee of service quality
Traffic management based on DPI technology. Application layer based on real application identification of QoS and management P2P control data, voice, video coexistence. Application layer based traffic monitoring and trend analysis. Isolation of security risks based on usage accounting. Equipment support 802.11e-WMM supports mobile terminal power saving mode. Supports WMM and 802.11p DSCP TOP bit mapping. Supports multiple queue mechanisms. Complete QOS mechanism to meet the service quality of campus network.
to sum up
In summary, thanks to a deep understanding of the network construction and application needs of the education industry, and with the help of a full range of products independently developed, Aotiandonglian will provide education industry users with unique industry-specific integrated network solutions Program. This solution fully meets the strict requirements of users in the education industry on the technological advancement, scalability, security, stability, operability, and management of modern education networks. And it will certainly help promote the in-depth development of the education industry's informatization construction, which will have a profound impact on the school's teaching model, teaching philosophy and teaching management. At present, the Aotiandonglian integrated campus network solution has been widely used in many education industry customers such as Beijing University of Technology, Nanjing Agricultural University, Dalian Jiaotong University, Henan University of Science and Technology, Jiangsu Institute of Technology, Xuzhou Industrial Vocational Technology College And because of good application performance, it has been unanimously recognized by our customers. For more information, please log in to the electronic enthusiast website (http: //)
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DC Output:4PCS 12V5A
DC Output:1PCS 19V4.7A
DC Output : 1PCS 12V300A
Solar Power Input:1PCS 18V50W
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Model:12V24AH(20Hr)
Caution
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Lead Acid Battery Bank
Lead Acid Battery Bank,Portable Battery Charge Pal
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