18650-2600 Li-ion battery with button top - Royal Battery Sales
Learn More About 18650 Lithium-ion Batteries -
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
Epoch 18650 2600mAh 8A - Protected Button Top Battery
Amazon.com: Fitinoch 18650 Rechargeable 3.7v Li- Ion Button Top Battery 2500mAh (2 Pack) : Health & Household