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) You get 1 free battery worth $99 with every jacket order but we recommend ordering a second spare battery so you can charge one while using the other one for all day warmth. Second battery is 50% OFF at only $49 *Just a reminder that our batteries come with a US adaptor. If you don't have one already - you can pick up an international travel adapter from supermarkets, post offices, variety stores, officeworks, travel stores etc for roughly $5-$20.