Savior Heat Spare Battery Rechargeable for Heated Products 7.4V 2200MAh/3000MAh

Capacity: 2200MAh / 3000MAh(Spare battery). Not necessary. The current battery technology is mature, and battery life will not be affected. There is indeed only one sock, because this sock is mainly used to wrap the battery, protect the battery, and prevent collisions.

SAVIOR HEAT 7.4V 2200mAh/3000mAh Li-Polymer

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