GSDT brings you a very good rechargeable 3.7v lithium-ion battery that you can use to charge your Cisco IP phones. The lithium battery has a 3.7 voltage output which helps your devices to have long battery life and also get charged very quickly and save lots of time. The rechargeable battery has 3.7 voltage and a capacity of 1100 mAh. The 3.7v lithium-ion battery can provide a long duration charge to allow you to talk for a long time without having to charge The lithium battery is compatible with most of the Cisco IP phones. The supported Cisco unified wireless IP phones are 7925 7925G 7926 7926G. The lithium-ion battery will be able to provide you with a constant flow of power at all times. The overall build quality of the 3.7-volt rechargeable battery is very good and durable. You can easily charge your phone within a short period and be able to use it again. Saving your precious time and allowing you to get your work done faster and more efficiently. The 3.7-volt rechargeable lithium-ion battery has undergone comprehensive testing including high altitude performance, vibration, mechanical shock, thermal cycling, external short circuit, and overcharge test simulations.