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Tool Talk Discussion Forum

Battery Powered Tools----What to do????

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Pappy

01-11-2004 21:41:28




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Over the past 15 years, I have had 8 re-chargeable drills. Some cheap-some pretty good. I have never had a mechanical failure of any of these tools, but the batteries fail in two years usually. What bothers me most is that two new batteries cost as much as a complete tool set which comes with two new batteries. Anyone have any good suggestions on how to get the batteries to last longer. I don't like to throw things away.

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larry in tn

01-12-2004 04:47:06




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 Re: Battery Powered Tools----What to do???? in reply to Pappy, 01-11-2004 21:41:28  
The other post is correct about the effect of heat on battery life. I keep my drill batteries in a insulated cooler while hauling them in my work truck. During really hot weather I also throw a couple of those little blue freezable packets in the cooler as well. Also as stated don't recharge a pack that is hot from use or heat exposure. Nicades should be completely discharge from time to time. This is not a real problem with drill batteries because the nature of their use tends to pull them down pretty well. A healthy pack should be able to hold up for 8 to 10 minutes under a moderate current pull of 500 to 800ma. Use a load resistor made up of three 5 ohm 10 watt Radio Shack resistors which will equal a current drain of approx 650ma. Monitor/measure pack voltage to insure that voltage doesn't drop below 1.20vdc per cell during discharge cycle. Lastly, fast chargers tend to heat the battery pack putting undue strain on the cell's. I made up some chargers out of old surplus DC power packs that are limited to a charge current of 150ma @ 24vdc. I let the packs charge for approx 10 hours using these chargers.
Has all this helped??? Yes. I have some packs that are still strong after 2 years of use. Before I started trying to save the packs they were lasting about 6 months.
Larry

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Benj. J. Joe Browning

01-11-2004 22:01:51




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 Re: Battery Powered Tools----What to do???? in reply to Pappy, 01-11-2004 21:41:28  
Hello Pappy, Try keeping the batteries cool. I sometime put them in a refrigerator for about 15-20 minutes. I do not know if this will lengthen the life. It help in the charging process. I usually get my batteries at pawn shops. Where I'm at, you can get the whole works (gun, two batteries, charger for less then the cost of a new battery.
Joe



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