In article ,
The Natural Philosopher wrote:
The only difference between deep discharge and standard is that standard
will survive going to half flat only but deliver more starting current
for a car. deep discharge go to about 75%-80% discharge without damage
but cant do starter motor currents so well.

We used standard car batteries to supply the power to sound etc equipment
on a soap opera backlot. 5-6 days a week. Two batteries used alternately
and charged each night. They never got more than half discharged. Both
were fine for more than 2 years. A much cheaper solution than pro Ni-Cads
etc for this purpose where size and weight didn't much matter.

The point being that car batteries can be an economical solution -
provided they're never run even close to flat.

--
*Honk if you love peace and quiet*

Dave Plowman London SW
To e-mail, change noise into sound.