Got battery-powered tools? Experienced failed batteries? Purchased new batteries, taken the case apart and replaced dying cells? Me too!
How'd you like a simple, cheap and super-fast way to return them to peak performance? ***Use your welder!***
I saw on YouTube a way to do this using a welder... tried it...
IT WORKED GREAT ON MY NICAD BATTERIES!
What you do is...
- connect your welder negative ground clamp to the negative terminal of the battery
- briefly touch the positive output of your welder to the positive terminal of the battery... repeat 5 to 10 times
- try the 'fixed' battery in your power tool, if good you're done, else go back to 2)
See the photo's...
I used wood screws to connect the welder to, in order to protect the battery terminals when I touched them - arc strikes.
In the photo below I used a DC arc welder, briefly tapping a positve electrode (flux removed from end to prevent any sustained arc) on a wood screw pressed again the positive terminal of the battery.
My recent experience...
I had three 14.4 volt NiCd batteries for my electric drill. I had rebuilt each one of them at least once, using any NiCd batteries that I had found on clearance sales; I removed the cells from the 'new' batteries (different battery cases) and used those new cells as needed to replace the low voltage cells in my existing batteries. That worked but it was time consuming... requiring disassembly of the batteries and much soldering.
I tried this Welder Trick = Simple, Fast & Easy.
I would describe my three batteries as #1: poor, #2 fair, #3 good.
I recovered battery #1 using my Mig welder - set at 130 amps.
I recovered battery #2 using my Arc welder - set at 130 amps.
After the welder-trick, batteries #1 and #2 were better than #3! So I gave #3 the same treatment (arc welder) as #2 and #3 picked up full performance too.
This use of a welder to recover ailing or dying NiCd batteries is Beautiful!
It seems that the momenatary burst of high amperage burns away the 'soft' short circuits inside the cells. It's these semi-short circuits that drain away the cell's power. The weak cell charges fast and the battery voltage looks good... until you put a load on it, then he battery voltage quickly drops and your power tool is useless. Left sitting, a fully charged NiCd drops in voltage over a few days and you go to use it - it doesn't last long! Once the cell has lost its charge, it acts like a resistor to the flow of current from all the other good cells. Your power tool slows down early because it's not getting full voltage or amperage - because the power is going into heating up the weak cell(s).
This is a Great Trick - Rejunivinate your Ailing NiCd Batteries.
Likely also work too for Nickel Metal-Hydride batteries.
I don't know about Lithium Ion batteries - different fish entirely!
Trick worked great for me... maybe save you a few bucks.