Please read the specification as below:
1) Rechargeable AA size batteries
2) Can be recharged simply by plugging into a USB port.
3) Widely used as common AA battery
4) Can be charged by normal charger
5) saves money and battery waste
6) Packing: 2pcs/blister card
7)norminal voltage:1.2V
8) typical capacity: 1450mAh, 800mAh, 500mAh, 300mAh
9) charge time: 5 -6 hours(by USB port)