The only thing standing between you and the warmest winter of your life. The Nu-Da rechargeable battery brings your new jacket to life. Lasting up to 6.5 hours and has a USB port for charging mobile devices. This battery powers ALL Nu-Da Jackets. PRODUCT FEATURES: 12 volt 10,050 mAh lithium-ion battery and charger adaptor Rechargeable Low 6.5 hours, Medium 4 hours, High 2.5 hours Cycle Life: 500-800 times With USB port to power most compatible devices such as cell phones (USB cable not included) Recharge phone 3-4 times Nu-Da battery has passed CE and FC certification BATTERY CAPABILITIES: capacity 10,050 mAh / 36.18Wh Input 12.6V/3A output 12V/3A USB output: 5V/2A Weight: 240 grams / 8.47 oz Charging time 2 hours INCLUDES: 1 x 12 volt Lithium-ion Battery:10,050 mAh 1 x Charger; Input Voltage: 100-240V US adaptor 1 x User Manual (English) Our batteries and jackets come separately. Please purchase both products. We did this specifically so you can tailor your Nu-Da experience to fit your lifestyle. All of our jackets are powered by the same battery, so one is enough no matter how many of our styles you love. Alternatively, if you need longer heating time (or you just forget to recharge it after use), grab an extra battery just in case.