Odec 18650 Battery, 2600mAh 18650 Rechargeable Batteries 3.7V Lithium ion for Headlamps, Flashlights Button Top (4 Pack) Battery: 4 pack 3.7V 2600mAh 18650 rechargeable lithium battery No memory effect. Batteries come pre-charged and can be used immediately out of the package Super long life up to 1200 cycle, convenient and more affordable than thousands of alkaline batteries Battery storage case allows you to safely store your batteries when not in use Fit for camera, watch, toys and many other electronic devices (Not for the devices match the Flat Top 18650 battery like Reuleux RX 200 and so on)