Buy Nitecore NL1836HP 18650 3600mAh Battery - Protected Button Top
Klarus 18GT-36 18650 3.6V 12.96Wh 3600 mAh li-ion battery (1pc)
KeepPower P1836J li ion protected 18650 3.7v 3600mah lithium battery
Amazon.com: Galaxy SHENMZ 4 Pack Battery for 3.7V 3600mAh Flat Top Battery, Rechargeable, 2 Bay USB Battery Charger for Flashlight, Camera, Small Fan, Sound Equipment.… : Electronics