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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Drivers, Test-load, Power Supply, & Batteries



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Old 01-19-2015, 12:39 AM #1
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Question survival laser 1.25A driver + nitecore rcr123

Hi all, I have a question about my first build.

Some specs:
Diode: 450nm M140
Driver: Survival Laser 1.25A
Battery: 2x Nitecore 650 mAh RCR123A

I cannot get the driver to pump using these batteries. Bench power supply at 5V or more works just fine, so it's not the diode. When I test the bats with a 10 Ohm resistor load I get 0.38A current, which is also correct. However, I cannot get the full combination to work together. One more thing - if I try to test with higher resistor values (eg 500 Ohm) the bats don't give any current.

I know there is some sort of protection circuitry inside these Nitecores, but I have no idea of its specs.

Help?


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Old 01-19-2015, 12:49 PM #2
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Default Re: survival laser 1.25A driver + nitecore rcr123

It sounds like a battery problem. Did you charge those batteries before using them? What is the voltage you measure on those batteries? They should charge to 4.2v.

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Old 01-20-2015, 12:18 AM #3
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Default Re: survival laser 1.25A driver + nitecore rcr123

Yup, charged to 4.2V. They're should to be able to pump out ~1.5A at 3.7V, so if it's a protection mechanism going-off I don't understand why. These are supposed to be good bats...

What would be the best way to test the battery alone?
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