Specifications:
1).Rechargeable high volume Lithium-ion Battery 820mA.
2).100% brand new. With protection circuit board.
3).It has a plug, you don't need any soldering skill to replace the battery now!
4).Product size:(L)33 mm x (W)31 mm x (H)8.0 mm.
5).Product voltage:3.7V(nominal) & 4.2V(full voltage).
6).Battery wire length: 50mm (1.97 inches).
7).Charging connection port 1.25mm 2 Pin Micro Connector Plug