crasster wrote: "From my experience YES YES YES desulfate those batteries!!!! We LOVE our battery minder desulfator. This is a personal testimony - I've brought back batteries that I thought were absolutely goners." snip
(off topic I know but) Yes. I have had similar experience with a completely drained/dead 4 year old 12 V car battery. (72 month prorated guarantee) After being unused/dead for +60 days, it took 2 days of charging. (0 amps @ +-13.2V at first) The battery finally did slowly start to accept a charge and eventually came back to life as if nothing ever happened. Initially, I didn't believe it either but it was still working fine when I sold the car 2 years later.
Chum lee