Nitecore NL1416R – Rechargeable 14100 Li-ion Battery (1,600mAh)

It is made for the NITECORE MT2A Pro, which also accepts two AA batteries as an alternative. Do not assume it fits another light just because the diameter looks close.

Because a flashlight this bright draws serious current, and an unbranded or unprotected cell under that load is how people end up with a hot pocket. Nitecore cells carry protection circuitry and are matched to their lights.

Several hundred full charge cycles with normal use. What shortens a lithium cell's life here is heat: a torch left in a parked car in Dar ages faster than one used every night.

Around half charged, in a cool place, terminals covered. Never store one flat, and never loose in a pocket or a drawer with keys and coins.

Spare lithium cells travel in cabin baggage only, never in checked luggage, with the terminals taped or in a case. Check the count your airline allows before you travel.

Stop using it. A swollen or dented lithium cell should be taken out of service. Do not charge it, do not puncture it, and dispose of it through a proper recycling point rather than in household waste.

When runtime has dropped noticeably against when it was new, or when it will not hold a charge for a week unused. A light that used to last a night and now lasts an hour is telling you the cell is done.