9V Rechargeable USB Batteries, 800mAh Lithium-Ion 9V Batteries with Long Life for Smoke Detectors, Microphones - Pack of 2

General Compatibility: The 9V rechargeable lithium-ion battery is compatible with a wide range of devices. Widely used in household appliances such as smoke detectors, walkie-talkies, game controllers, toys, microphones, multimeters, portable radios, electric guitars, massage devices, alarm clocks, remotes, and more. Environmental Friendly: The REACELL 9V 800mAh rechargeable battery has a lifespan of up to 1,200 cycles. Moreover, the battery does not contain Hg/Cd/Pb and is non-polluting. They are more environmentally friendly and efficient than disposable alkaline batteries (Note): The standard voltage for all REACELL lithium-ion brand batteries when fully charged is 8.2 V to 8.4 V. Multiple Charging Options: They have no memory effect, low self-discharge, and can be charged at any time. It can be connected to most USB sources such as a PC, car charger, wall charger, etc., for an additional charging option. Integrated LED indicators allow you to check the charge status. Faster and Easier Charging: Due to the USB charging design, the REACELL 9V battery block only needs 1.5 hours to fully charge. It saves you a lot of time. It's very convenient to charge the battery anywhere, anytime. You no longer need an additional charger.