Amazon.com: Galaxy SHENMZ 2 Pack Battery for 3.7V 3400mAh Flat Top Battery, Rechargeable, 2 Bay USB Battery Charger for Flashlight, Camera, Small Fan, Sound Equipment.… : Electronics
3.7 Volt Panasonic 18650 Lithium Ion Battery (3400 mAh) with Tabs
New 18650 Battery 3400mah 3.7V NCR18650B Rechargeable Lithium Battery for Flashlight LED Torch DIY Power Bank High Capacity Cell|Replacement Batteries| - AliExpress