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Old 10-30-2014, 02:10 AM #1
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Default How safe is it to run a M140 and 9mm diode off of one 18650?

How safe would it be for a laser that typically uses two 3.7V batteries? I've heard some people say it's totally fine and all it does is produce a significantly weaker output but doesn't damage the diode or driver in any way. Just double checking in case it could be damaging my laser.

edit: I worded the title weird, I'm not going for any double diode build shenanigans off of one 18650 :P I just mean how safe is it to run either a m140 or 9mm off of one 18650


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Old 10-30-2014, 02:35 AM #2
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Default Re: How safe is it to run a M140 and 9mm diode off of one 18650?

Correct, that is safe, although silly.
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Old 10-30-2014, 02:52 AM #3
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Default Re: How safe is it to run a M140 and 9mm diode off of one 18650?

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Originally Posted by Cyparagon View Post
Correct, that is safe, although silly.
Thanks! I only ask because I don't want my diode heating up too much when I'm trying to get the focus to infinity just right.
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Old 10-30-2014, 07:21 AM #4
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Default Re: How safe is it to run a M140 and 9mm diode off of one 18650?

Its fine... as I mentioned this is how I set the focus on the grooves Youll get around 200 mW output with your laser. See my old FS thread for more details.
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Old 10-30-2014, 07:23 AM #5
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Default Re: How safe is it to run a M140 and 9mm diode off of one 18650?

Quote:
Originally Posted by grainde View Post
Its fine... as I mentioned this is how I set the focus on the grooves Youll get around 200 mW output with your laser. See my old FS thread for more details.
Talk about a brain fart. Thanks for reminding me, forgot you mentioned it.
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Old 10-31-2014, 06:34 PM #6
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Default Re: How safe is it to run a M140 and 9mm diode off of one 18650?

I often run my 2x16340 lasers (the ones with buck or linear drivers) with a single 18650. It's nice to have a safer low power mode for indoor use.

Never heard of a laser being damaged by this practice.

Note that this does have some side effects beyond the lower power - many of my lasers have higher diveregence and more "LED emission" with a single battery, because they are lasing close to threshold. And every time a laser starts up it will have a different power, since it's not under regulation. This sucks in that sometimes you have to keep "restarting" the laser until it starts with the power you want.
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