Our USB Rechargeable Portable Power Source and 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.