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 Laser Pointer Forums - Discuss Laser Pointers High V Battery, 1 Ohm R Test Load

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03-16-2013, 05:26 AM #1
 Member Join Date: Jan 2012 Location: San Luis Obispo, CA Posts: 45 Rep Power: 0
Spyrius
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High V Battery, 1 Ohm R Test Load

I have two questions:

How accurate is a test load composed of just a one ohm resistor?
I calculate the current by measuring the voltage across it.

Is there a battery the size of the 22600 battery that provides at least 5.5V?
I need something that will fit in an MXDL host and will power a 1.65 amp X-Drive V6.

-Thanks

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03-16-2013, 06:49 AM #2
 Class 3R Laser Join Date: Feb 2012 Location: Pittsburgh Posts: 1,282 Rep Power: 276
ryansoh3
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Re: High V Battery, 1 Ohm R Test Load

Quote:
 Originally Posted by Spyrius How accurate is a test load composed of just a one ohm resistor? I calculate the current by measuring the voltage across it.
Depends on the specs of the resistor. Check out the tolerances listed.

Most are within +/- 10%, loosely speaking.

Here's an example: 1.0 ohm 10W 10% Wirewound Resistor (2-Pack) : Resistors | RadioShack.com

Quote:
 Originally Posted by Spyrius Is there a battery the size of the 22600 battery that provides at least 5.5V? I need something that will fit in an MXDL host and will power a 1.65 amp X-Drive V6. -Thanks
You're looking at 2x li-ion cells for a buck driver (x-drive) setup.

Finding batteries half the size of 22600/22650 will be tricky. The closest you could get would be 16340 or 18350.

I suggest you an x-boost or a similar boost driver.

Good luck!
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03-16-2013, 06:00 PM #3
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Cyparagon
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Re: High V Battery, 1 Ohm R Test Load

lawl @ 5.5V being high voltage
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03-16-2013, 10:44 PM #4
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Spyrius
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Re: High V Battery, 1 Ohm R Test Load

Quote:
 Originally Posted by Cyparagon lawl @ 5.5V being high voltage
It's "high" compared to most of the rechargeable batteries we commonly use
with lasers.

I tried 2x 16340s, they provide the right voltage, but don't fit in the host.
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03-17-2013, 02:14 AM #5
 Class 4 Laser Join Date: Oct 2007 Location: Oregon, USA Posts: 5,478 Rep Power: 3157
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Re: High V Battery, 1 Ohm R Test Load

Maybe 2x 15270s (CR2 size)? The battery size of these is indicated by the number (DxL, e.g. 22600 = 22mm x 60mm). Don't those MXDLs take 3x 10440s as well?
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Last edited by Bionic-Badger; 03-17-2013 at 02:14 AM.

03-17-2013, 04:06 AM #6
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Spyrius
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Re: High V Battery, 1 Ohm R Test Load

So 3x 10440s in series might work?
Is there a special holder for that?
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445nm 1.5W DIY C2 M140 Laser
450nm ~150mW DIY OSRAM PLB450 C6 Build

03-26-2013, 06:01 AM #7
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Re: High V Battery, 1 Ohm R Test Load

Yes, a 3xAAA holder.

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