Amazon.com: PKCELL ICR18500 Battery 3.7V 1400mah Li-Ion Rechargeable with Button Top 6PC(They are not AA Size Battery) : Health & Household
Amazon.com: Kratax 1.5V Rechargeable AA Lithium Batteries 4 Pack Upgraded 3500mWh High Capacity 3A Li-ion AA Battery, 1600 Cycles, Precharged, Constant Voltage Output, Fast Charging-Charger not Included : Health & Household