[77newell]

Richard's recommendation is spot on in my opinion, except for possibly one teensy thing. The batteries on my 77 coach froze solid with bulging sides when I owned it years ago. After I thawed the batteries I alternated trying to slowlycharge them and doing the desulphation routine. The sides never completely straightened but the batteries worked fine for another 4 years. You won't know til you try. Sometimes miracles do occur. I didn't think it would work, but trying was essentially free, so I gave it a shot. With a smart charger that won't charge into a shorted battery I had to take my time with the smallest charge rate since the charger thought it was shorted because the battery was so flat.