i'd try battery addive
on the dead ones.
as long it dosen't smell burnt or shorted.
even the good ones.
works for me.
YES...but draining car "starting" battery don't like to be draind BUT.
like todays cars & trucks put a lite drain, like dome light,computerS,onstar, alarm. auto matic lights ya know the kind that stay on for like 1 min,phone charger,clock ,gps , remote starter.radio,tv, cb,frms,that remember. ect....bla bla bla.
if you have lots of storage ie. batteries & don't drain-em to deep "like a car"& FREE..........run-em.
run-em if ya got-em
get all ya can.
i haven't bought a battery since 1994.
and don't need to get any more right now.
even in -36 deg.cars, van & house.
help keep-em out of the dump.that's a good thing.
so....any ways....there's a pulse thingy & a desulfamafugit.it probly works... alot of people are sold on-em here.
but i don't have extra power...or cash..
FREE & WORKS ?
run-em.