*Current stock has been upgraded to the Premium ANKER Power Bank. ANKER is the leader in power banks on the market. They are currently a 13000mAh capacity power bank so will run 25% longer than advertised runtimes. The ZBP10400 USB Power Bank Battery 10400mAh can provide more than 3x charging for your smartphone and/or up to 12 hours of heating time in VENTURE HEAT's 5 Volt heated clothing. Note: Charge the battery by plug-in the included micro USB cable into your computer USB port or use the USB charging adaptor come with your smartphone. BTW: Battery sold with 6 months Manufacturer Warranty.