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16340 Battery
A 16340 battery is a small rechargeable lithium-ion cell, about 16 mm wide and 34 mm long, built in the same size as the disposable CR123A. Hunters use it in compact lights, lasers and some optics where a reusable cell beats buying throwaway batteries every season.
We carry the KeepPower 16340 950mAh RCR123A2, a protected button top cell. Protected means it has a small circuit that cuts power if the cell is overcharged, over-drained or shorted. The button top lets it make contact in devices with recessed terminals.
16340 battery vs CR123A
The two share a size but not a voltage. A CR123A is a 3 volt lithium cell you use once. A 16340 rechargeable battery runs around 3.6 to 3.7 volts and starts higher than that fresh off the charger. Some devices handle that range fine; others can be damaged by it. Check your manual for RCR123A or 16340 before you swap.
You'll need a lithium-ion charger with a bay sized for 16340 cells. For larger cells, see our 21700 batteries. Batteries can't be returned, so confirm the fit before ordering, or call (309) 781-8421 and we'll help you match it to your device.
Frequently Asked Questions
What does a CR123A or 16340 battery fit?
The CR123A size goes in compact flashlights, laser pointers, cameras, some rangefinders and red dot sights, and plenty of small hunting lights. A 16340 is the rechargeable version of that size, but its higher voltage means you should confirm your device accepts RCR123A cells before you put one in.
What is a rechargeable 16340 battery?
It's a lithium-ion cell you can recharge many times instead of tossing it after one use. The KeepPower 950mAh cell we carry is protected, so a built-in circuit guards against overcharging and short circuits. For gear you use every week, that adds up quickly compared to buying disposables.
What kind of batteries go in a flashlight?
It depends on the light. Small lights often take AA, AAA, CR123A or 16340 cells, while bigger hunting lights and IR illuminators use 18650 or 21700 lithium-ion cells. The battery tube is sized for one format, so check the label on the light or its manual and match both size and voltage.
Which battery lasts the longest in a flashlight?
Larger lithium-ion cells usually run longest because they hold the most energy, which is why many hunting lights use 18650 or 21700 cells. In the small CR123A size, a disposable lithium cell typically holds more capacity per use, while a 16340 gives you a higher voltage and can be recharged.
How do I identify battery sizes?
For lithium-ion cells, the number tells you. The first two digits are the diameter in millimeters, the next two are the length, and the final 0 means the cell is round. So a 16340 is 16 mm by 34 mm, an 18650 is 18 by 65, and a 21700 is 21 by 70.
