The ActionHeat 7V batteries are compact and powerful.NOTE: These are 7-Volt batteries and will only work with ActionHeat 7-Volt Products.Compatible With: ActionHeat 7V Heated Sleeping Bag Pad ActionHeat 7V Battery Heated Throw Blanket Specifications: Lithium-Polymer Core Capacity: 5000maH/37Wh Charging Time: 4-6+ hours Dimensions: 8.3cm x 6.1cm x 2cm Output: 7.4V / 2A (max) Input: DC 8.4V / 2A (max) Battery Care: It is important to maintain at least 25% of your battery power when not in use. Failure to do so may result in performance problems and reduced battery life Disconnect the battery packs from the gloves when not in use Do not wash batteries Battery Set Includes: (1)7.4V 5000maH Rechargeable Battery (1) Charger Kit (NOTE - Only use this charger for the batteries)