Rechargeable AA Battery: Upgraded doublepow aa rechargeable battery is longer lasting compared with other same capacity batteries,perfect for household electrial device like wireless mouse, camera, electric toy, remote controlled toy, mouse, flashlight, bathroom scales, medical devices etc 1.5V Constant Voltage Output: AA lithium batteries are continuous steable output 1.5V voltage for whole process untill the charge completely deplete, suitable for houshold electrial device with high power requirement 8 Bay Battery Charger: This charger has 8 separate battery compartments that can individually charge a SinceHoly 1.5V battery. It can also be used as a battery storage compartment for easy portability. Not recommended for charging other brands of chargers Unique USB Input Design of Battery Charger: Easy to charge,while charging,just plug the charging cable to adapter with usb port like laptop,powerbank etc(charging cable included,adapter not included), plug the other side into type c port of charger.easy to operation Fast Charging: The battery charger input voltage is 5V/3A, output is 5V/250mA, which can fast charge 1.5v aa lithium battery. After fully charged,charger stops output, the relevant battery icon will keep bright Rechargeable AA Battery: Upgraded doublepow aa rechargeable battery is longer lasting compared with other same capacity batteries,perfect for household electrial device like wireless mouse, camera, electric toy, remote controlled toy, mouse, flashlight, bathroom scales, medical devices etc