RECHARGEABLE 7V BATTERY 30SEVEN®
Duration of heat depends on the heat setting you use.
It is obvious that well-insulated shoes keep feet better warm, so you can set the temperature of the heated insoles at a lower level which significantly prolong the heat duration.
Battery characteristics :
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1 x Li-ion battery 7.4V / 2000 mAh
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With proper use, rechargeable up to 500 x without significant capacity loss.