Replacement Battery for Milwaukee USB Chargeable LightsCharges Milwaukee® REDLITHIUM™ USB Batteries via Micro USB CordCompatible with Milwaukee® USB Rechargeable ProductsMore Runtime: 2X more Capacity than (3) AAA Alkaline BatteriesCharges Mobile Phones, Tablets and Wireless Headphones via 2.1A USB output.LED Fuel Gauge Allows Fast Checking of REDLITHIUM™ USB Battery ChargeOur REDLITHIUM™ USB Charger & Portable Power Source Kit includes a USB rechargeable power bank and charger, a 2 ft. heavy duty micro-USB cord, and one of our REDLITHIUM™ USB batteries. The portable battery charger allows you to conveniently charge your mobile phone, tablet and wireless headphones both on and off the job site. You can check the charge of your REDLITHIUM USB™ battery pack with the LED Fuel Gauge. The portable battery pack can easily be recharged via Micro-USB cable from a wall plug or USB power source. Both the REDLITHIUM™ USB Battery and Portable Power Source and Charger are covered under our MILWAUKEE® 2-year warranty.