DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (
-   Electrical (
-   -   Has anyone tried this way of fixing a dead cordless tool battery? (

BJLower 01-29-2010 10:11 PM

Has anyone tried this way of fixing a dead cordless tool battery?
According to a vidio on U-tube, if you strike a dead rechargable battery about 5 times with an electric welder it will break enough of the "fibers" that form that ruin the memory on a rechargable battery to make it work again. I've seen Internet adds that claim you can do it with a battery charger, but seeing this vidio I think you need to use a heavy duty charger and strike the battery like the vidio shows with the welder.

I know replacing the battery is the should do thing, but this is for an older set of tools. The important on being an angle head drill for those tight spots.

If you know a way that does work, I'd like to know.

I tried one of those new cordless hammers at Home Depot. I don't know if they will put in as many nails per battery as they claim, but you want to try one of these. It "slid" a 16 penny nail iinto an oak board like the proverbial hot knife through butter. It vibrates the nail in without you feeling much of anything in your hand. It's on my "things I want list".

Just Bill 01-30-2010 06:16 AM

That does not sound like something I would even consider. The batteries could explode.

beenthere 01-30-2010 06:30 AM

Sounds dangerous to do.

DangerMouse 01-30-2010 07:46 AM

i MIGHT consider trying it if it was wired to a long cord, set behind a tree and 'sparked' from a safe distance....
i have some good tools i can't get batteries for (cheaply or at all) any more.


joed 01-30-2010 09:35 AM

I did not watch the video but I have done something similar by hitting the individual cells with a 12 volt charger for a second. It works sometimes but not always.

tpolk 01-30-2010 09:46 AM

when the battery starts getting hot in your hand probably good time to leave room. please make video so we can all see

beenthere 01-30-2010 09:46 AM

There are companies that rebuild battery packs for cordless tools. See if any are close to you.

beenthere 01-30-2010 09:57 AM

Somewhat off topic. But it may be of interest to anyone thinking of trying to use a welder on a battery.

A guy i use to work with, didn't have his right hand.

At the age of 11 he and a friend found a dud commercial fire cracker(forget which type).

The fuse had gone out when it was launched the night before, so it didn't go off.

They decided to light it and throw it in the air. The other kid lite the fuse. And before the guy could throw it, it went off in his hand. When he woke up. He had a thumb dangling. They cut it off in surgery later. It was too badly mangled to work right. He has a hook for a right hand.

48 years later. He still regrets that day.

BJLower 01-31-2010 09:28 PM

We'll give it a try with one of the 3 battery packs and I'll post what happens
The U-Tube vidio she tells you the voltage to set the welder at, but he only hits the negative side of the battery pack 5 times with a very fast striking motion. From what he says that very fast jump in voltage breaks the strands that form and ruing the batteries. I'm sure if you held the welder onto the battery for very long at all soemthing that would not be a whole lot of fun would occur.

We've tried the rebuild places, but they won't do these particular battery packs becasue the say the 8 sub-C batteries don't like to fit back into the pack. If the welder doesn't work, we'll have to DIY the packs ourselves.


I grew up in the first farm township south of Chicago,that was across what used to be Route 66 from Joliet known for it's famous prison. This was one of those things that if you couldn't do it you were a "wussy".

If you set the firecracker so that the bottom of it are just barley touching the tips of your thumb and index finger even a Black Cat will just push your thumb and finger apart and doesn't hurt at all.

If you think that was crazy, I worked in the oil fields on the Ute Indian Reservation in the North-West corner of Utah to pay for my college. The great part was that you worked a week on and then got a week off and we backpacked in Yellow Stone all of the time.

Food in oil boom towns was incredibly expensive, so I had to learn to catch Rattle Snakes with my boot. You poke them with a stick until the are really mad and then let them strike the bottom of your boot. Thier fangs get sruck in the leather, so you just put your boot down and cut the head off. Yes, Rattle Snake tastes great. In Florida I can at least tell people that if they like Alligator they would love Rattle Snake.

I bett it's not real tough to figure out that learning to catch the Ratlle Sankes puckered my behind up a lot worse than lighting a fire cracker off in my fingers, even though I'd seen other people do both a lot of times.

jayp 02-01-2010 09:37 AM

how about this?
Instead of going to all that trouble, why don't you just buy another battery?

Gigs 02-01-2010 12:00 PM

Don't do that to a lithium-ion battery. If you do it could burst into flames at worst, and at least it will destroy the protection circuitry that's inside of them.

For ni-cad or lead-acid it's not as dangerous, but the smaller the battery is the more likely it's going to explode. There are safer ways of doing this than using a welder. Welder just has too much energy.

Here is what happens with a lithium ion battery overheats:

BJLower 02-01-2010 01:31 PM

Why the Nickle-Metal-Hydrid batteries disapeared so quick
The NMH batteries seamed like they would be great when they firs came out, they were very light in weight and very fast charging.

They had the major problem of over heating very badly if you tried to draw power out of them fast though. We were at a remote control airplane field and literally saw a guys plane catch fire in the air.

Loved the film of the PC with a Lithium battery catching fire, I'm typing on a laptop that has a Lithium battery rigth now.

All times are GMT -5. The time now is 09:34 AM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Search Engine Friendly URLs by vBSEO 3.6.1