2400mAh lithium batteries are suitable for all models of LENZ heated products (except insoles). You can control the heating level directly on the body of the cell or via the Bluetooth application on your smartphone. The batteries last for up to 14 hours per charge. Light lithium batteries are suitable for LENZ heated products: Socks Vests Gloves Heat bandage LED System You can control the power of heating directly on the battery - 3 levels or remotely through the LENZ application on your smartphone - 10 levels. The LENZ application is available on these links: App store Google play Battery life: Product Level 1 Level 2 Level 3 Socks 10 - 14 5,5 - 7,5 3,5 - 4,5 Vests 5,5 - 7,5 3 - 4 2 - 2,5 Heat bandage 5,5 - 7,5 3 - 4 2 - 2,5 Gloves 6 - 7,5 3 - 4 2 - 2,5 LED system 14 - 40 Values are given in hours: Package includes: 2x rechargeable lithium battery rcB 1200 1x USB charger 100-240 VAC 1x USB cable with charging indication Download manual here