Panasonic Li-ion 18500 Rechargeable Cell: 3.6V 2040mAh …
https://www.batteryspace.com/panasonic-li-ion-18500-rechargeable-cell-3-6v-2040mah-7-34wh--ncr18500a---un38-3-passed.aspx
WEB3.6V 18500 size Cylindrical Li-Ion Cell; Lighter weight and higher energy density than any other rechargeable cell; 18500 cell is a little shorter than the 18650 cell, and it is perfect for building compact sizedpacks and high capacity packs for RC aircraft, RC cars, or camera battery. Voltage: Nominal Voltage: 3.6V; Charging Voltage: 4.2V
DA: 84 PA: 24 MOZ Rank: 49