6 Led's off 4 Coin batteries, best config?

Streak

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Jan 31, 2002
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711
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ex South Africa now SoCal
6 Led\'s off 4 Coin batteries, best config?

I want to run six 5mm 20/30mA Led's connected to 4x3v (12v total) coin batteries and to get the best run time off the batteries.

What design criteria do I need to take into consideration eg. would I need to get the lowest Vf Led's, do I connect three serial pairs of leds in parallel or some other way etc. etc.

Once I get this right I will add a flashing circuit which would extend the battery life further.

Do you get good and bad coin batteries ie. are all CR2032's made the same or do some have much better power density than others?

TIA

Streak
 

Skibane

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Nov 26, 2002
Messages
285
Location
San Antonio
Re: 6 Led\'s off 4 Coin batteries, best config?

I assume that you're talking about WHITE leds...

Just out of curiosity, why are you restricting your battery choice to just CR2032 cells? There are a lot of other coin cell sizes out there –

Generally, one fat coin cell has a higher power density than two thin ones.
 

Streak

Enlightened
Joined
Jan 31, 2002
Messages
711
Location
ex South Africa now SoCal
Re: 6 Led\'s off 4 Coin batteries, best config?

Hi Skibane.
Yes white or blue which would be the higher current drawers but maybe red, amber as well.

There is a space restriction. I have considered the CR2354 which has more than double capacity but they may not fit.

Thanks for the reply anyway.

Regards

Streak
 
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