In message , Gary
writes
Yes. Car lead acid batteries ain't designed for deep discharge. Horse
person should have bought the more expensive types designed for
this. But
better still use a load which switches off before taking the battery too
low.

You could try a long charge with a high voltage DC source, like an
ancient
unregulated battery charger - or a bench PS set to about 30 volts. But
make sure the bench one has current regulation as if the battery does
recover, it will try to draw lots of current at this voltage.

Hmm.. I suppose I could try the 24V setting on trickle charge,
supervised!

regards


For the future they could get a solar trickle charger.

What! You expect a horse person to spend money on something not directly
attached to their pet?

I think I will pass on the groups comments about fully discharging *car*
batteries and make sure my battery is returned before this happens. Now,
if I only knew the current drawn by the energizer....

regards

--
Tim Lamb