Rechargeable Battery for PowerFLARM Flex

18650 Battery, Rechargeable, Li-ion, Panasonic NCR18650GA or Molicel INR-18650-M35A, Unprotected, Flat Top, 3.6V, 3450mAh, Max Continuous Current: up to 10 A ,

Length: 65.0 mm, Diameter: 18.5 mm, Weight: 48 g

Recommended for the PowerFLARM Flex.  Powers the PowerFLARM Flex for 10+ hours

You can find less expensive 18650 batteries online, but I prefer the quality of the Panasonic or Molicel brands.

NOTE: Max Length that fits into a PowerFLARM Flex: 65.4mm.  "Protected" and "Button Top" batteries are too long.