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18500
18500 batteries are rechargeable lithium-ion cells that measure about 18mm across and 50mm long. They are shorter than the 18650 cells many thermal scopes and lights use, so they only belong in a device built for that length. If your optic, light or battery cap calls for an 18500, this is the page.
Right now we carry the 18500 K15 Vapcell Battery 1500mAh, sold as a set of 2 batteries. Two cells let you keep one in the device and one charging, which matters on a long cold night when lithium cells drain faster.
Before you order
Check your manual for the exact size. A battery 18500 and an 18650 look alike, but the 18650 is 15mm longer and will not fit a compartment sized for the shorter cell. Also check whether your device wants a button top or a flat top cell, and charge these cells on a lithium-ion charger, not a NiMH-only unit. Our battery chargers page has Xtar and Nitecore chargers that handle Li-ion cells.
Batteries can't be returned once they ship, so call us at (309) 781-8421 if you are not sure which cell your gear takes. For packs and other sizes, see batteries, external battery kits and chargers.
Frequently Asked Questions
How do you say 18500 when ordering a battery?
Most people say it as eighteen-five-hundred, or eighteen-five-oh. The number is a size code: 18 is the diameter in millimeters and 50 is the length, with the trailing 0 meaning a round cell. So an 18500 is an 18mm by 50mm cylinder, like the Vapcell K15 we carry.
Is the Vapcell K15 18500 good quality?
We chose the Vapcell K15 because it is a known cell with a stated 1500mAh capacity, which is a solid number for the 18500 size. Treat any lithium cell well: charge it on a proper Li-ion charger, store it partly charged, and replace it if it gets hot or swells.
Is the 18500 battery universal?
No. An 18500 only fits devices made for that length. It is shorter than an 18650, so it rattles in an 18650 compartment and may not make contact. Some lights and battery caps are designed for the short cell to save weight. Check your manual before ordering.
How many 18500 batteries come in a pack?
The 18500 K15 Vapcell listing is a set of 2 batteries. Having a pair is handy for devices that take two cells, or for swapping a fresh cell in while the other one charges. Keep spares in an inside pocket on cold nights so they hold their charge longer.
