Yeah. What Tim said. :-)
Chuck Norcutt
Tim Hughes wrote:
> Usually the biggest damage with deep discharging mismatched cells is that the
> reverse charged (
> low capacity ) cell voltage soon reaches a potential at which electrolysis
> takes place. It
> actually depends on the chemistry what this voltage is, so for lead acid
> batteries for example it
> is much higher than niCd say, although in electronic devices, deep discharge
> of Pb does not
> normally cause cell reversal because battery impedance becomes too high as
> cell aproaches zero
> volts. In reverse charge (in niCd,NiMh), unlike in forward charge mode, any
> evolved gasses do not
> recombine, so pressure rises and the cell vents through the normal pressure
> relief valve (under
> the cell +ve end) causing loss of electolyte. This causes further loss of
> capacity every cycle as
> the weak cell quickly gets weaker and hence more and more reverse charged
> each cycle.
... etc, etc.
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