OP... your battery has no idea when your bike is hot or cold, so I would think your problem in in the starter circuit...remember, when the bike is 'hot' and ridden for some time , the battery should be at the peak of it's charge!, some very looong posts here on that subject relating to 650 80-82's. If you go for a ride and the next morning the bike starts fine with the battery spinning the starter good, then the probs. not the battery IMO.