From
Instructables, revive Nicad Batteries by Zapping with a Welder.
Here's a method of bringing them back to life by zapping those shorted crystal dendrites away with too much current and/or voltage. We'll use a welder as a power source. You could also use a car battery, a DC powersupply, or almost anything with some voltage. Charged-up capacitors are popular for this because you can get a very fast pulse out of them and still limit the power. it's a lot safer that way.
:cool:
[youtube]ENmAJ2GOAMY&eurl[/youtube]
I wonder if it works for dilithium crystals.
What are they in, a dildo? :haha:
Is that guy wearing a flak jacket? I hope so.:smack:
Dendrites? Weren't they the bad guys in
Army of Darkness?:rolleyes:
Been doing this stuff for a long time. Won't go into details. However a precaution. Do not do that technique to lithium batteries. Unlike NiCds, Lithiums can explode harmfully.
Been doing this stuff for a long time. Won't go into details. However a precaution. Do not do that technique to lithium batteries. Unlike NiCds, Lithiums can explode harmfully.
NiCds are cool though? This could have saved me some bucks...
Yeah, me too. If tw wasn't so busy playing to his lurkers, he could have been helpful. :rolleyes:
Trick to 'curing' NiCd typically was not performed as in that video. Most don't have a high current low voltage power source. We take a power supply and reverse apply voltage to an offending cell to accomplish same 'burnout'.
This problem is more often created by over discharging a series of batteries. Series as in four 1.5 volt batteries makes 6 volts. One weaker battery becomes so discharged that the other batteries actually reverse charge a weak cell. Then the weak cell shorts.
Solution was to drive a larger current in reverse across the battery to 'burn out the short'. Then charge each battery separately. Remember weak cells needs more energy. But if rechargeing then all in series, then a weak cell remains weaker. Batteries must be recharged seperately (or in parallel) so that the weak cell can accept more current - more energy.
The video did not show that concept and did not show why a weak cell would remain weak; to fail again.