Kratax USB Rechargeable AAA Batteries, 4Pcs 1.5v 1000mWh Lithium Batteries AAA, 1.5H Fast Full Charged, over 1200 Cycles, 4-in-1 USB to Micro USB Charging Cable - Walmart.com
Amazon.com: 4 Pcs ICR 10440 Rechargeable Lithium Ion Battery,3.7v Batteries 350mAh (0.39 * 1.73 inch, Shorter Than AAA Size) : Health & Household