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Tool Talk Discussion Forum

freeze rechargeable batteries---fact or myth

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ldj

11-04-2007 07:46:29




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I've got 2 19.2 volt rechargeable batteries that won't charge any longer. I've noticed for a few months they won't hold a charge as long. I checked the price for them and I might as well buy a new drill. I've heard about freezing them. Will this work or not?




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azkiwi

12-16-2007 16:14:37




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
I"ve been the Voltman route and there were OK (except they lost my address and email and I had to call them a month later to get my batteries. However after not a lot of use, and outside the 90 day warranty, both opacks quit again and won"t take a charge.

At least the DeWalts just get weaker and don"t actually quit. And they go a lot longer in the first place.

So I"m not sure they are really worth the $40 plus shipping.

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Stephen R. Horton (Tx)

11-06-2007 14:55:31




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
I tried that freezing, smacking stuff. It didn't work for me, so I say myth. I took the 18v batteries for my Dewalt tools apart, removed the NiCd cells, and put in the latest NiMh Sub-C cells that I could order off of Ebay. It cost me about $80 per battery. It was a tedious couple of hours worth of soldering (note I don't solder for a living, so I'm not very good), but my buddies are amazed at how long my batteries last. Really. I used 4200 milli-Amp-hour cells; my Dewalt charger takes a while longer to get them to full charge. But, they last for a LONG time. -stephen

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Crem

11-05-2007 17:26:07




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
I have taken a number of bad battery packs apart and usually have found that one or more batteries are corroded. I have already made one battery pack out of two bad ones, but it is a pain in the a$$ to do.



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T_Bone

11-04-2007 15:49:21




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
Hi lbj,

My son recently had a Millwaukee 18v battery quit. After he found out the replacement cost, he split open the case and found a burned out diode? thermasistor? Geez my memory and he won"t be home for a few days.

Anyway he replaced the componet from RS for under $2 and once again the battery worked. That"s been over 2yrs ago. He said he didn"t know what the componet was and took the old one to RS and they identified it.

T_Bone

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glennster

11-04-2007 15:18:04




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
see if you have an interstate battery dealer around, they zoom around in a truck and sell car batteries. they can rebuild the batteries for around half the cost of a new battery. the case is dis-assembled and the batteries are replaced with new ones in your old case. i had them do my dewalts, they are 35-40 dollars a battery vs 75 for a new one.



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Slowpoke

11-14-2007 00:11:23




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 Re: freeze rechargeable batteries---fact or myth in reply to glennster, 11-04-2007 15:18:04  
Interstate does not rebuild batteries in my area of California.



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phil lowe

11-04-2007 14:17:59




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
di the same thing with couple drill batteries ,took them to a battery re-build place ,it was pricey ,but the quality Battery and the umph the batteries had was better then the originals when new



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MeAnthony

11-04-2007 12:54:47




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
You could check out Voltman Batteries. Supposedly they can rebuild your batteries better and cheaper than new.



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RustyFarmall

11-04-2007 12:19:27




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
You need to go shopping on Amazon.com I found a very good deal on brand new batteries for my drill.



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jokers

11-04-2007 08:31:25




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
We did it with a bunch of Motorola radio batteries and it did work for awhile.

We froze them and then smacked `em pretty hard a couple of times each on a table. They lasted another few months until we started swapping them out with LI-ON batteries.

The freezing and smacking process may be repeatable, I don`t know. You should also consider that the batteries we froze get charged and discharged daily so the process may last much longer than a few months when used on tool batteries that aren`t cycled daily. Remember, nothing ventured nothing gained!

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Gerald J.

11-04-2007 08:02:45




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 Re: freeze rechargeable batteries---fact or myth in reply to ldj, 11-04-2007 07:46:29  
Probably some of the cells have whiskers inside shorting them. I suppose freezing might move the guts enough to break the whiskers. That I've not tried. I've worked at blowing the whiskers out of NiCads, but always found the cells that grew whiskers were too weak to not be reverse charged when under load soon again and to regrow the whiskers.

I find that rejuvinating old NiCads as about as productive as trying to recreate yesterday's lunch from the left overs in the garbage can.

Take the battery packs to a battery store like Interstate batteries and have them rebuilt. That will be cheaper than a whole new replacement and the ones I've had them do have worked better than the original did when they were new.

Gerald J.

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