Battery Cell 18650 is Lithium-Ion cell (Batcell 18650) is used for our 900, 1000, 1100, 1200, 1300 series lights. 

Battery Cell 32650  is used for TL2900P, TL3800P, VL4600P, VL4600PB, VTL2900P, VTL2900PB, VTL4200P, VTL4200PB

The battery has a custom designed protection circuit which provides a variety of protection features built into the battery.