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Old 03-03-2012, 05:20 PM   #1
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Power tool batteries and maintenance


Anyone else drain their niCD batteries completely before recharging them?

While liIon have no memory effect the suck when they're old and just die. I have 6 niCD batteries and they're beasts. I've had them several years and always run them in my drill with the trigger taped on till they die completely. It's a bit extreme but that's why I don't need to replace my $80 a piece batteries.

Any suggestions on a better way to discharge these batteries? They're ridgid 18volts

Al

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Old 03-03-2012, 05:24 PM   #2
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Power tool batteries and maintenance


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Last edited by joecaption; 03-03-2012 at 05:27 PM.
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Old 03-03-2012, 05:30 PM   #3
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Power tool batteries and maintenance


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Originally Posted by Albe View Post
Any suggestions on a better way to discharge these batteries? They're ridgid 18volts

Al
A 120v, 60W incand. bulb will discharge this battery at about a 1A rate, a 100w bulb at about 2A and 30' of #30 AWG wire wrap wire will do about 6A (and get pretty hot).

Last edited by Yoyizit; 03-03-2012 at 05:32 PM.
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Old 03-03-2012, 08:02 PM   #4
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Power tool batteries and maintenance


draining a nicad battery till its totally dead is a bad thing, once you notice a power drop in the tool it should go on the charger. i learned this years ago both from the reps with the tool companies and also from a few trade publications


lith ions can be charged at any time as they have a chip inside them which eliminates "memory"
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Old 03-04-2012, 04:44 PM   #5
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Power tool batteries and maintenance


I've heard 80% depth of discharge (DOD) is OK.
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