Quote:
Originally Posted by johnlvs2run
This thread seems the closest to my question, so here goes. I have charged my chevy batteries for many years, without disconnecting any cables from the car - however found this in the 1999 honda owner's manual.
Is this really necessary?
Do you disconnect the cables when charging a car battery?
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Because the battery presents a large load to the charger, the charge voltage
will normally never climb above what's used to charge the battery as you drive.
(Alternator charging).
But, some (Dumb) high current chargers will apply a lot of voltage to the battery,at the end of the charge.
It could be up around 15v or more.
The worse case scenario is connecting a dumb charger to a battery that has an open cell.
That's when the charger could put extra high voltage on the battery, and the electronics in your car.
The stuff that stays on all the time.