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Old 10-26-2007, 06:57 AM #1
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Default batteries for GB diode

hey guys,

i would like to squeeze my gb diode into a small enclosure, and i was wondering if i would be able to use any smaller battery size than AA and CR123 ( i am using daedals circuit design and need at least 6 volts).

Would it be possible for me to hook 4 watch batteries in series to get 6 volts? will they deliver enough current?

thanks a lot

dil


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Old 10-26-2007, 12:01 PM #2
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Default Re: batteries for GB diode

Just an afterthought..

if four button cell's wont do it for some reason, eg. capacity too low, would it be possible/advisable to connect one CR123 to two button cells in series to get the correct voltage, and sufficient capacity?

thanks again
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Old 10-26-2007, 02:22 PM #3
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Default Re: batteries for GB diode

Never mix battery types. Bad Things can happen
The GB diodes draw a significant amount of current. I doubt you'd get even a minute off a stack of watch batteries. Also watch batteries are made for longevity, not high discharge rates, so you probably couldn't get enough current out of them in the first place.
I suppose there are AAAA and N batteries but 4 of those would probably still be bigger than 2 CR123s.
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Old 10-26-2007, 07:24 PM #4
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Default Re: batteries for GB diode

there are very small 6v lithiums at camera stores
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Old 10-26-2007, 08:08 PM #5
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Default Re: batteries for GB diode

The problem is still there. How much current can a battery that small source? In testing some CR2032s I found that one could supply almost an Amp, but over just a few milliseconds it dropped to around 65mA. I'm still working on an LDO regulator, pulsed driver, and a few 2550s to see what I can do in a $1 pointer size.
I assume that's what you're wanting Dil.
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Old 10-26-2007, 10:10 PM #6
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Default Re: batteries for GB diode

I think the most viable option for something relatively compact is using 2 CR2 cells.

You could also run it off 4 NiMH cells, which are available in tiny sizes and supply amazing amounts of current for their size. Obviously they'd be empty quickly but can easily be recharged.
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Old 10-26-2007, 10:32 PM #7
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Default Re: batteries for GB diode

well if you need small, compact and high discharge, Li-Ion and Li-Po are the best batteries for the job! Although you ABSOLUTELY MUST have a proper charging circuit for them, otherwise if you overcharge it, you will loose your laser and possibly your house! On a good note, i have a tiny Li-Po, it weighs close to nothing, and is TINY! it has an output of about 4V at 600mah, so two in series should do ya, but remember what i said above, i am afraid to charge my Li-Po because of that! Just have a look on youtube for exploding lithium batts, you will soon see why!
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Old 10-26-2007, 10:42 PM #8
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Default Re: batteries for GB diode

hey thanks for the replies guys!

I think i'd be able to fit in 4 x AAAA or 2 x CR2's - the problem is with the CR123's fatness - i have enough length to fit two of those in, but the enclosure is unusuall and curves in at the sides, so the edges arnt wide enough to have 2 CR123's.

which one do you think would be better/higher capacity? 4 x AAAA or 2 x CR2?

thanks again!

dil
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Old 10-27-2007, 11:51 AM #9
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Default Re: batteries for GB diode

Do you actually get AAAA lithium cells, or are you considering alkalines?

4A alkalines or NiMH's have a capacity in the order of 200 mAh, CR2 lithiums are rated around 600 mAh usually... so that's much better.
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Old 10-27-2007, 08:05 PM #10
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Default Re: batteries for GB diode

If the 123A is juat a little too big, what diameter and length are we working with?
pics might help
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