Old 12-02-2009, 09:42 AM #1
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Exclamation need info on 18650 battery OD and length

I am going to need a 18650 3.6 volt rechargable battery and do not have one for an O-like 250-300mw green laser module and need to know what size in mm is the diameter of the battery and the total length of it. If you know please send me a reply back, also the highest charge it will hold is 4.2 volts right and not higher? I don't want to ruin the module. THANKS.


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Old 12-02-2009, 10:39 AM #2
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Default Re: need info on 18650 battery OD and length

18650 -> 18 - 65 - 0
18mm in diameter
65mm long

Sometimes they're a little longer if they have a protective PCB (which you should absolutely make sure that they have). Protected PCBs will prevent the battery from charging past 4.2V. If you charge an unprotected battery past 4.2V, you could risk fire/explosion.
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Old 12-02-2009, 03:27 PM #3
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Default Re: need info on 18650 battery OD and length

Protected cells may also be slightly wider, usually because of the extra heatshrink to hold the protection circuit. Lithium-ion batteries follow this naming scheme (in mm):
XXYYZ
XX= diameter
YY= Length
Z = Type (0 for cylindrical, 1? for prismatic, etc.)

Just expanding on what jwc said
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