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Default How to check holdingcapacity of rechargeable NiCd batteries

Hi out there in cyberspace,
got a bunch of power batteries for various batt.operated tools and other
things.
After some cycles of charging and discharging some deteriorations of holding
capacity can be noted ;some before their
time of reasonable lifecycle. Yes a good charger will prevent improper
charging.

However most of these powerpacks consist of numerous individual cell like
subC etc.
Do I assume correctly, that if a powerpack goes down ,not all individual
cells are to blame and some me be still quiet
allright und of further use?
How can someone check out which one to toss(into recyclebin) and which one
to reuse?
Any idea if evaluation can be accomplished with DMM or any specific
procedure?
I think many friends out there might be intertested to learn about!
Please reply to forum to enlighten (me) !
Thank You MS