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Tool Talk Discussion Forum

Cordless Batteries ????

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Jake

11-21-2003 04:50:50




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I have been told that you should fully discharge a cordless battery before you charge it. This is supposed to greatly improve the life of the battery. I have never had a complaint about these batteries, but a light came with my new craftsman 19.2 volt cordless drill and I was told by a fellow worker that I should use it to completely drain the battery before recharging it.
Is this true?




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evielboweviel

11-22-2003 07:07:38




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 Re: Cordless Batteries ???? in reply to Jake, 11-21-2003 04:50:50  
ideally you would discharge a battery until the first cell is drained, not the complete battery. past that point that cell could reverse.
as far as heat goes you will destroy a battery in short time if you recharge when it is hot. Learned this the hard way about two hundred in new batteries later now understand. I got used to pulling battery packs out of drill motor or flashlight and putting in charger. When I got a circular saw and ran the batteries down in 10 minutes or less and then recharged them right away I went thru four batteries ( about two days) before I wised up

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Ludwig

11-22-2003 06:04:32




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 Re: Cordless Batteries ???? in reply to Jake, 11-21-2003 04:50:50  
JD and John are right its the frequent small recharges that kill batteries.
Don't take your batteries under half a volt per cell, you'll get a reversed cell and then the battery is junk.
Just run 'em down and charge 'em up, they'll be fine.

As to the fellow who mentioned heat. A hot battery has alot more resistance in it than a cool one does. Cold is the same way thats why your car starts harder in the winter. At about room temp the electricity will flow into the battery better. Most newer battery chargers will adjust for the temp of the battery but older and cheaper ones won't.

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John

11-21-2003 22:28:14




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 Re: Cordless Batteries ???? in reply to Jake, 11-21-2003 04:50:50  
it is not necessary to completely drain the battery by using the light. when the drill slows down, just put the battery in the charger. However, don't take it out of the charger, drive two screws and then put it back. that will shorten the life of the battery.



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JD

11-21-2003 10:30:02




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 Re: Cordless Batteries ???? in reply to Jake, 11-21-2003 04:50:50  
The best advice is to check with the manufacurer of the particular battery pack. There are a lot of urban myths floating around about the care and feeding of nicads.

Running the battery all the way down can lead to a cell reversal. Try pricing a new battery pack and see if it doesn't cost a lot more than our advice.



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Jake

11-21-2003 09:07:19




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 Re: Cordless Batteries ???? in reply to Jake, 11-21-2003 04:50:50  
Thank you all.



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Jim in N M

11-21-2003 07:39:06




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 Re: Cordless Batteries ???? in reply to Jake, 11-21-2003 04:50:50  
I've always been told to remove the battery and let it cool before charging,never charge a battery that is hot or warm from being used. I sure don't know why, I've been told they charge better ????? ????? ? Jim in N M



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Ben in KY

11-21-2003 06:28:56




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 Re: Cordless Batteries ???? in reply to Jake, 11-21-2003 04:50:50  
Ig NiCad fully drain, if NiMh then a full drain is not necessary. The new NiCad do not have as much of a memory problem as the older ones but it its still there.



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DavidO

11-21-2003 09:48:30




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 Re: Re: Cordless Batteries ???? in reply to Ben in KY, 11-21-2003 06:28:56  
While the NiMh batteries do not tend to have the "memory" problem of NiCad, they do need to be fully discharged and recharged periodically to get full battery capacity from them. Part of the equipment that I maintain includes 103 laptop computers with the new type batteries. With the onscreen display of battery condition, it is obvious that the batteries that stay plugged up all the time begin to loose capacity. Discharging and recharging them restores full capacity.

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Dusty

11-21-2003 05:51:24




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 Re: Cordless Batteries ???? in reply to Jake, 11-21-2003 04:50:50  
That was true with the earlier ones but I don't think so with todays batteries.

Dusty



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Mac

11-21-2003 06:24:02




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 Re: Re: Cordless Batteries ???? in reply to Dusty, 11-21-2003 05:51:24  
I dont think the new bats. develop a memory, therefore you dont need to fully discharge them.



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