Anker’s PowerCore line has reigned as our readers’ favorite USB battery pack for nearly a year, and its long awaited sequel has rolled out in the form of the PowerCore II.

Grab the brand new PowerCore II 20000 for just $37. In addition to a fresh new design, the PowerCore II includes three high speed USB charging ports with a whopping 30W shared between them, plus dual 10W microUSB inputs, allowing you to recharge the entire brick in under six hours.