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Tool Talk Discussion Forum

Freezing a battery

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MT Pockets

04-08-2004 16:26:39

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A couple of weeks ago someone suggested freezing a power tool battery overnight to rejuvenate it. I tried a 12v off of a Skil drillmotor that wouldn't charge at all. It didn't make a new battery out of it, but it is now usable again. Anyone else try this? Steve.

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Note

04-10-2004 12:48:23

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Re: Freezing a battery in reply to MT Pockets, 04-08-2004 16:26:39

Best prices I've found(about 1/2 my retailers price)on Skil(old ones too)amd Bosch batteries.Internals thru 18V and chargers.

Skil/Bosch

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greenbeanman

04-09-2004 06:52:57

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Re: Freezing a battery in reply to MT Pockets, 04-08-2004 16:26:39

I'm one for three with the effort.
My 15+ year old Skil high dollar drill batteries had been dead a couple of years before trying this, so didn't really expect miracles. Neither of the two took a charge.

My Skil cordless screwdriver did however. Seems to have plenty of power too.

I'm certainly content with having a free screwdriver once again. Otherwise I probably would not have replaced it. It too had been dead about two years. Like I said on page three, I don't know why I hadn't tossed it, but am glad I didn't.

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MarkB

04-09-2004 06:13:13

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Re: Freezing a battery in reply to MT Pockets, 04-08-2004 16:26:39

I've dropped NiCads to get them working again, but I haven't tried freezing them. Fortunately, everything I have now uses NiMH or Li-Ion, so I don't need to resort to such tactics any more. As others have said, NiCads are prone to internal shorts; if dropping them can break the short I suppose freezing will work too.

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Joe (Wa)

04-08-2004 21:21:17

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Re: Freezing a battery in reply to MT Pockets, 04-08-2004 16:26:39

I did a Porter-Cable 12v drill battery. It is definitely better but haven't really worked the drill so jury is still out.

It used to get very warm on high charge. First charge after freeze room temp or slightly warmer.

It used to go dead inserted in the idle drill over 3-4 days.

Just checked it, been in the idle drill 5 days, seems to run drill full speed *BUT* 10.2v on Fluke. Back in the charger.

I suspect that the freeze may be disrupting the memory inherent to poorly serviced Nicads.

Joe

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04-08-2004 20:49:53

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Re: Freezing a battery in reply to MT Pockets, 04-08-2004 16:26:39

Yeah, I did....and...it worked!

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Frank M.

04-08-2004 18:24:31

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Re: Freezing a battery in reply to MT Pockets, 04-08-2004 16:26:39

I tried an old Skil cordless drill with the non-removeable battery. It didn't work on that one. I've got a Black & Decker, similar to it, and about the same age, in the freezer right now. I'll know tomorrow if it works.

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Jon H

04-08-2004 17:32:43

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Re: Freezing a battery in reply to MT Pockets, 04-08-2004 16:26:39

That thread is on page 3 and it looks like 3 out of 4 had good results. Mine was a NI-CAD battery,anyone else have this trick work with a NiMH or lead acid gel cell. My NI-CAD battery was for a UHF business band portable radio,it would no longer accept or hold a charge,$90 and no longer avalible. After the freezer treatment and rewarm, it showed full charge after 3 hrs in the fast charger. Using the radio for a load test,it would power the radio at the 4 watt transmit setting for an hour. This is as good as a new battery. I let the battery set around for a few days and it still powers the radio on the high wattage setting so seems to hold a charge. After cycling this referbished battery several times,I checked it's voltage after a day of powering the radio on standby. It registered higher voltage than a known good battery,so I do not think it has any weak cells. Anyone have a theory as to why this works on a NI-CAD battery to unshort or remove the dreaded NI-CAD memory ?

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RayP(MI)

04-08-2004 18:43:31

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Re: Re: Freezing a battery in reply to Jon H, 04-08-2004 17:32:43

Other than drying out, nicads will sometimes develop a short (cat's whisker) between the positive and negative in the battery, effectively shorting it out. Old solution was to momentarily contact the battery in parallel with a higher voltage source, like a 12volt power supply. Sometimes this worked. Haven't heard of the freezer treatment prior to this. Also, try batteriesamerica.com - those folks are very accomodating about building replacement batteries for unusual applications. sometimes, they'll even rebuild your existing battery.

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