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Old 11-05-2012, 04:55 AM #1
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Default Using NiMh batteries for 1W+ lasers?

Would it be ok to drive a 1W+ laser off of 3x NiMh cells. Each cell (that I'm using) has about 50 mili-ohm impedance. So, in series there would be a whopping 150mOhm of impedance. Would it be OK to still use that to drive a laser, or should I just stick with a lithium cell?

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Old 11-05-2012, 05:11 AM #2
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Default Re: Using NiMh batteries for 1W+ lasers?

I doubt the NiMH batteries could handle the load well. We all use lithium batteries for a reason bro. They are far superior for more reasons than I feel like typing on my phone lol.
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Old 11-05-2012, 05:15 AM #3
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Default Re: Using NiMh batteries for 1W+ lasers?

Yes, NiMH would be fine. 3.6V is 3.6V is 3.6V. As long as the internal resistance doesn't cause unacceptable voltage sag, you can use any battery you like. Hell, you could use a 4V SLA if you were feeling adventurous.
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Old 11-05-2012, 05:18 AM #4
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Default Re: Using NiMh batteries for 1W+ lasers?

Quote:
Originally Posted by Cyparagon View Post
Yes that would be fine. 3.6V is 3.6V is 3.6V. Hell, you could use a 4V SLA if you were feeling adventurous.
Hahaha. I know the voltage does work out nicely, and that is why I would like to use them. I'm going to use eneloops and from my experience they are pretty good at handling large current.

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I doubt the NiMH batteries could handle the load well. We all use lithium batteries for a reason bro. They are far superior for more reasons than I feel like typing on my phone lol.
I'm a big fan of flashlights, and because of that I have a shit ton of lithium batteries, but I can't bring myself to take a part any of my Fenix lights to make my first host out of, so I am going to use and old NEBO light from my handgun. It uses 3x AAA, and would be perfect for my 1W laser. And then I can put it on my gun

Last edited by Weegidy; 11-05-2012 at 05:25 AM.
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Old 11-05-2012, 07:16 AM #5
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Default Re: Using NiMh batteries for 1W+ lasers?

I wouldn't expect much runtime on three little AAA NiMH batteries though. As far as I know NiMH drains its capacity much faster than lithium does as current increases which is why any super high draw device of good grade runs lithium. Not to mention the greately increased density of power capacity. I would suggest getting three 10440 lithiums and modifying the powerpack to run them in parallel.
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Some of the collection:
-405nm -811mW - S06J@490mA - Aurora C6
-445nm -3.04W - 9mm@2.2A - Ultrafire L2
-445nm -2.95W - M140@2A - "Hyperion" Black Ice/Flash Freeze hybrid
-445nm -2.2W - M140@1.8A - Aurora C6
-445nm -1.93W - M140@1.8A - Blue Ice by yobresal
-450nm -1.67W - PLTB450@1.7A - Survival Laser S4
-488nm ~25mW - "The Beast" JDSU Argon Ion
-520nm -132mW - PL520@390mA - Minisabre V2
-532nm -374mW - Skylaser HL532 300mW
-532nm -90mW - SD-303
-532nm -110mW - 50mW FastTech Module - DTR Skyray
-543nm ~.3mW Melles Griot HeNe
-638nm -1.3W - ML501P73@1.5A - Survival Laser S4
-638nm -1W - ML501P73@1.4A - Ultrafire WF-602C
-650nm -324mW - 3.8mm OpenCan@428mA - C6
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Old 11-05-2012, 02:01 PM #6
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Default Re: Using NiMh batteries for 1W+ lasers?

That's the best idea I've ever heard.... I can't believe I didn't think of that. Thank you!
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Old 11-05-2012, 02:58 PM #7
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Default Re: Using NiMh batteries for 1W+ lasers?

Quote:
Originally Posted by ApexProxy View Post
As far as I know NiMH drains its capacity much faster than lithium does as current increases which is why any super high draw device of good grade runs lithium.
Nah, NiMH is good for high current, too. Two examples would be "the torch" battery and battery packs for many (most?) power tools. Energy per unit weight is higher for lithium, but energy per unit volume isn't much higher.

I'm not saying NiMH is better than lithium, I'm just saying NiMH isn't a bad choice.
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Old 11-05-2012, 06:35 PM #8
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Default Re: Using NiMh batteries for 1W+ lasers?

Well, 3 eneloops are rated at 800mAh. 3 IMR 10440 cells (350mAh each) would be 1050mAh and have about 30mΩ internal impedance (80% less than the NiMh!)

I guees I get the laser up and running with AAAs and then I can move to 10440 once I know it's worth the $20.
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Old 11-05-2012, 07:42 PM #9
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Default Re: Using NiMh batteries for 1W+ lasers?

Quote:
Originally Posted by Weegidy View Post
Well, 3 eneloops are rated at 800mAh. 3 IMR 10440 cells (350mAh each) would be 1050mAh and have about 30mΩ internal impedance (80% less than the NiMh!)

I guees I get the laser up and running with AAAs and then I can move to 10440 once I know it's worth the $20.
Sounds like a solid plan bro.
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NEW 1.5-2.5W 445nm Blue Ice/Black Ice/Flash Freeze Lasers FREE US Shipping!
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Some of the collection:
-405nm -811mW - S06J@490mA - Aurora C6
-445nm -3.04W - 9mm@2.2A - Ultrafire L2
-445nm -2.95W - M140@2A - "Hyperion" Black Ice/Flash Freeze hybrid
-445nm -2.2W - M140@1.8A - Aurora C6
-445nm -1.93W - M140@1.8A - Blue Ice by yobresal
-450nm -1.67W - PLTB450@1.7A - Survival Laser S4
-488nm ~25mW - "The Beast" JDSU Argon Ion
-520nm -132mW - PL520@390mA - Minisabre V2
-532nm -374mW - Skylaser HL532 300mW
-532nm -90mW - SD-303
-532nm -110mW - 50mW FastTech Module - DTR Skyray
-543nm ~.3mW Melles Griot HeNe
-638nm -1.3W - ML501P73@1.5A - Survival Laser S4
-638nm -1W - ML501P73@1.4A - Ultrafire WF-602C
-650nm -324mW - 3.8mm OpenCan@428mA - C6
-650nm -128mW - 3.8mm OpenCan@200mA - C6 (Mohgasm JAD)
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