RECHARGEABLE 9V BATTERIES: The ANVOW rechargeable 9V batteries built in USB charging port, 1-2 hour fast charging and up to 1000 cycles, no need to buy batteries frequently. Whether in home or outdoor, you can simply charge it with single USB port.
TRUE 9V BATTERY: Ours battery voltage is 100% 9 volts, other's 9V battery is 8.2V-8.4V when fully charged. It means that you have more options for your electronics, like garage door openers, smoke detectors, microphone, gps, home security and more.
1000mAh 3.7V LITHIUM CELL: The Battery Cell is 1000mAh 3.7V lithium cell, We boost the voltage from 3.7V to a constant 9V through a special process. Therefore, the discharge test to measure the true capacity needs to consider the voltage transition.
NERGY SAVING & ECO FRIENDLY: Mercury, Cadmium and Lead are not used in these batteries; These 9V batteries can be recharged 1000+ times, saving thousands of alkaline batteries and reducing a significant about of landfill waste.
PACKAGE: 4 x USB rechargeable 9V batteries, 1 x 4 in1 Charging Cable; By the way, the charger is not included, and don't charge four batteries at once on the PC computer or any other device with an output current of 1A.