- Can Ni-cad batteries be saved?
A the ni-cad batteries of some of my ‘less used’ cordless tools aren’t holding their charge for long at all. They haven’t seen a lot of use at all.
Boefore I stump up for new batteries, does anyone know if they can be revived and how to do it?Posted 8 years ago
With counselling and the help of the Lord, I’m sure they can be helped.
But they have to want to be saved.Posted 8 years ago
Never heard of a method for saving them.
Assuming you are fully charging & discharging them then I think it’s “game over”.Posted 8 years ago
there is meant to be a way. Never tried it myself but keep meaning to. It involves shorting the NiCad across a car battery for a second a few times. Sounds quite risky hence my reluctance……
Try googling for nicad battery saving or something like that. Lot’s of people are selling the instructions on ebay for a couple of pounds, or you can find on some of the powertool forums or DIY forums a link to a site where some kind soul has pasted the instructions.
All the usual disclaimers apply if you do try it though……Posted 8 years ago
The radio ham guys used to do it by flicking the leads of a higher voltage battery across the Nicads but as large418 says you need to know what you’re doing 😯Posted 8 years ago
Isn’t that for when the charger doesn’t recognise them though – i.e. they have been completely discharged?
I find that Ni-Cads still respond to the fully charge, fully discharge method. i.e. fully charge them, then leave something rapidly discharging them until they are dead – try and leave it a few seconds and they try to use the last drop of power, until you really can’t get any more out of them. Then fully charge them and repeat 3 times.Posted 8 years ago
It might depend on whats caused them to lose their umph. Repeatedly part-charging them upsets them, they acquire a sort of memory and won’t charge past that point. Storing them part charged/uncharged does for them too, in that case its to do (if I remember right) with crystals growing between the elements inside the battery and causing lots of little shorts, so that the battery self-discharges. Although whether the cures for both those instances is the same I’m not sure.
What make of drill is it – NiCad battery packs are a lot cheaper than they used to be, and there are aftermarket one for some of the bigger brands, but not all brands are available still.Posted 8 years ago
ni-cad batteries stop working because of crystals forming between the plates (im told) this can be fixed by putting an excessive charge through them for a very short time.
what you need is a dc supply much higher then the voltage of the battery, such as an arc welder. there is a sort of technique where you kind of strike at it as if striking a match. maybe 2 or 3 times. the battery must be flat at the start.
obviously this is very dangerous and i therefore dont recommend anyone does it but i have and it did work
here watch this – http://www.youtube.com/watch?v=ENmAJ2GOAMY
edit before the stw pedantic police turn up that is a mig but i only have an arcPosted 8 years ago
I’ve tried the applying a car battery across nicads for a very short time before and it does help but not enough to be worth it. Better spending your time finding a cheap source of batteries. If you are a real cheapskate or the batteries are very expensive then I’ve taken car racing packs to bits before as a very cheap source of good tabbed nicadsPosted 8 years ago
i tried it after i google it for instruction ,on a 18 volt that wouldnt hold a charge. i zapped it with 36 volts and left it to cool, recharge it perfect use it every day 😀Posted 8 years ago
have heard it work after using welders on lots of forums… personally would’t dare when they are cheap..Posted 8 years ago
So did you dare mk1fan?Posted 8 years ago
I don’t have a welder to hand but can do the charge – discharge cycle thing so will try that for the 14.4V ones.
I’ve found a 9,6v replacement for £25 so may just get that for the 9.6V one.Posted 8 years ago
A 9.6 will be may not actually fit, it’ll be physically smaller than the current one you’ve gotPosted 8 years ago
The 9.6v replacement will be too small to replace the duff 9.6V battery?Posted 8 years ago
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