(ET) charging batteries

[Neil Dennis <wombat RealNS com>]

Yes, batteries are "heat-sensitive", as the battery gets warmer it will
outgas at a lower charge voltage and can go down as low as 2 volts/cell
if the battery is really hot (80 to 100 C).  The recommented best
charging method  for industrial use is constant current until about 90%
of full charge, than constant voltage to complete as this is
automatically self limiting.  Use about 2.35 volts max per cell.  My
book says that a battery may be charged at an amp rating equal to its
amp/hour rating if fully discharged - i-e a 100 amp hour battery may be
charged at 100 amps.  If only 60% discharged the rate should be 60 amps
and ad-infinitum.  I'd guess that your linear supply would be good if it
is "stiff" enough in regulation to maintain a fixed voltage over that
big an amp range.

wombat