Restore those dead cordless tool batteries.

[Wildman]

From the many you tube vids it appears to work and if they are dead what have you got to lose. https://www.youtube.com/watch?v=0D5J_-fTTKQ

 

[ColeyS1]

I wouldn't try it with lithium ion if you value your appearance !

Sent from my SM-G900F using Tapatalk

 

[Wildman]

I do believe it specically says NiCads in the video. There are other vids on sorting out Lithium batteries in a different way altogether.

 

[Racers]

You can do the same thing with an old fashioned battery charger, possibly a safer option.

Pete

 

[Monkey Mark]

You can do the same thing with an old fashioned battery charger, possibly a safer option.

Pete

It depends what the voltages are. It needs to be a higher voltage that you put into it to "burn" the whiskers off. I have done it using a welder before.

 

[mind_the_goat]

I've tried it on ni-cads. Took the pack apart and did the cells one at a time , tested to see if they if they were shorted first, used a small 12V lead acid battery to zap the cells. It did clear the shorts but lasted for only a couple of charges.
I'm certainly not prepared to to try my welder on them.

 

[Mike.S]

I had my Makita Ni-Cd battery refuse to charge - charger's lights suggested battery was 'dead'. Found several YT videos suggesting similar remedies to that posted but one suggested just quickly turning on/off the charger's power several times whilst the charging switch was 'on'. Took a couple of attempts - I just pressed the 'on' (charge) switch and immediately flicked on/off the switch at the power socket and suddenly the battery could be charged.

Have charged it about 3-4 times since over several weeks and no apparent impact on effectiveness. Simple, cheap and 'nothing to lose' remedy.

 

[Monkey Mark]

You can buy desulphators that do this for you. Basically they pulse the battery very quickly. Last time I checked I couldn't get one for 18v batteries, but this may have changed now. .