Thanks to all who replied. Summary below.
Lead/acid batteries do not have memory (only NiCads).
Discharging lead/acid batteries below 9V or so is bad and
will reduce ability to fully recharge - may still get up to
12.6 or 12.7 but will not take original load.
"Battery Tender" or "Battrey Buddy" type rechargers are
fine if they give enough "float" voltage - but a "stronger"
charger of the constant voltage type (not constant current
type) seems to be prefered and may be successful in
restoring an over-discharged battery. I've no idea how to
identify a constant voltage charger!
I'm about ready to give up on SBS batteries. They're much
more expensive ($240) and don't seem to have any practical
advantages. One recommendation is to buy the rechargeable
battery jumper boxes (Harbor Freight and many other places
for $39 and up) take out the batteries for the race car and
replace as necessary.
Hawker Energy "http://www.hepi.com";
- also "http://www.odysseyfactory.com";
- and - "http://www/enersysmp.com";
Derek
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