MDHAND 4-Pack Rechargeable Batteries, 6000mah 3.7 V Lithium-ion Rechargeable Battery is Suitable for Electronic Devices Such as Strong Light flashlights - Walmart.com
UltraFire 3400mAh 3.7V 18650 USB Rechargeable Lithium Battery with Pro
Lithium Ion 18650 Battery: 3.7V / 2600 mA-hr from 64seconds on Tindie