18650 vs 18500 Lithium-Ion batteries (Button top vs Flat top) - YouTube
Amazon.com: ICR18500 Battery 3.7V 1400mah Li-Ion Rechargeable with Flat Top 6PC(They are not 1865mm Batteries Also Not AA Size Battery) : Health & Household
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.…