The ActionHeat 3000maH batteries are super slim, sleek and powerful. They are designed specifically for all the 1 amp output ActionHeat products including 5V gloves, 5V socks, and 5V headwear. The ActionHeat batteries can be doubled as a device charger because of its unique 5V USB output. Just plug your USB cable into the battery and charge your phone, tablet, or camera. Specifications: USB output: 5-Volt/1 amp max Micro-USB input: 5-Volt/1 amp input Lithium-Polymer Core Battery Voltage: 5-Volt Dimensions: 7.2 cm 4.25 cm 1.35 cm Capacity: 3000maH/11.1WH 4 LED indicators display battery life and charging status Charging Time: 3-4 hours Compatible with: ActionHeat 5V Heated Premium Gloves ActionHeat 5V Heated Snow Gloves ActionHeat 5V Heated Glove Liners ActionHeat 5V Socks ActionHeat 5V Balaclava ActionHeat 5V Heated Hat Set Includes: (1) Rechargeable 5V 3000mAh Batteries (1) 24" dual battery charger kit ActionHeat 5V 3000mAh Power Bank Kit - Single