Warmthru Deluxe Hotmitts: Rechargeable Battery Heated Ski Mittens (X-Large) If you suffer from cold extremities or circulation difficulties such as RAYNAUDS, try these amazing Warmthru Hotmitts Triple the heat of comparable gloves due to 2 batteries per mitten Concealed pockets neatly hide batteries away. Waterproof zips guard concealed battery pockets Includes: (4) 3.7v rechargeable Li-ion batteries and (2) battery chargers plus Car Charger