Use these 3.7V spare batteries with Warmthru Fingerheater Gloves, Socks, Mittens and all Gloveliners. Especially useful on long journeys - just replace the ones you have used up with these new charged up ones.
Especially useful on long journeys - just replace the ones you have used up with these new charged up ones. Batteries last around 2-3.5 hours in continuous use, depending upon which heat setting.!
