Panasonic NCR18650B 3350mAh, 4.87A Button Top Li-Ion Cell
Amazon.com: PKCELL ICR18500 Battery 3.7V 1400mah Li-Ion Rechargeable with Button Top 6PC(They are not 1865mm Batteries Also Not AA Size Battery) : Health & Household
3.2 Volt LiFePO4 18650 Button Top Batteries (1500 mAh) - Only Batteries