This is Ledlenser's own 18650 lithium-ion rechargeable battery, a spare or replacement cell for compatible Ledlenser lights that run on a single 18650 cell, such as the TAC6R tactical torch. It has a capacity of 3000 mAh at a nominal 3.6 to 3.7 V, giving 10.8 Wh of energy. The cell measures about 65 x 18 x 18 mm and weighs around 50 g. It is rechargeable and replaceable, so a charged spare lets you swap batteries in the field instead of waiting for a recharge, which is useful on patrols, hunts or camping trips. Ledlenser advises checking your product manual or existing battery to confirm your torch is designed for an 18650 lithium-ion cell before buying. Supplied as a single battery in Ledlenser packaging.