ok ok, i expected that... but I did have some valid points...
So I reiterate... hopefully edited to the point of satisfaction...
Artv -
The questions in there are not entirely clear, and I think you may be mixing a few things together and around that might be confusing you.
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reverse charge it breaks the electrolyte down into hydrogen and oxygen
This is true for any chemistry that has a water based electrolyte. Not only for reverse charging, but 'normal' charging as well. NiCd and NiMH generally have some method of dealing with the gasses so that the pressure does not build inside of the cell to the point of danger. There are various mechanisms for this. Some use recombinant technology, others simply vent it.
There are also design considerations taken to prevent more of one gas than the other by doing things such as making one plate a different size than the other, and so on.
I'm not sure what you're getting at with your diode, cd player motor, and capacitors. The good news is that chances are, you're not dealing with enough energy to get yourself into trouble. Yet... Smiley
As for other things...
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Don't bother even trying with other chemistries.
I'd take it a step beyond that. Not only don't bother, don't attempt it with some. Lithium in particular, should you find yourself ever inclined to do so. They strike back with a vengeance when you pi$$ them off.
And topics...
<cut that part out>
Steve