1.5V Lithium Batteries AA Rechargeable,4-Pack 3500mWh Double AA Li-ion-Hixon
Capacity(Energy): 3500mWh / 2300mAh. Common AA battery sizes:14 14 50(mm). Battery Technical Specifications Battery Number2 pc batteries. Battery SizeLI-ION. Input/Output:5V/1.5V(can be used in series).