A backup battery for any PWR modular product. Use this 3350mAh PWR Bank as an additional battery for your PWR bike light, to charge your phone, watch, Garmin, Christmas mitten warmers.whatever device you like. We aren't the first to seek a better use of batteries. Think about power tools that have a universal battery system. Each device powered by the same battery is another opportunity to save. Save the environment, save space, save weight, and perhaps most important to you save money. After all, batteries often make up over 50% of the cost of these types of products. COMPATIBILITY The 3350mAh PWR Bank is compatible with the 600, 1000 and 1800 lumen PWR lightheads and PWR outdoor products CHARGE YOUR DEVICES Use this PWR Bank to charge your iPhone or cycling computer on the go. BATTERY OUTPUT 3350 mAh DIMENSIONS 104mm x 30mm � WEIGHT 98g WHAT'S IN THE PACK PWR Bank battery USB Cable BATTERY USB Rechargeable Li-ion battery CHARGE TIME 5hrs