TQ, I wish you better luck than I have had with Interstate batteries. Maybe it's me, but I have never had an Interstate battery live out its warranty period. All were automotive applications but on at least 6 different cars, never had one that lasted. Every time I have spoke with an Interstate representative, they all say how good their warranty is. My reply is "Yes, the warranty is good but I would rather have a Good battery than a Good warranty".
Think about it,,If a battery (or any other product) is really good, you shouldn't need a warranty to start with.
As far as an Odyssey battery goes, I have never used one. On the surface they seem to be the answer but don't they need a special charger? The PC545 seems to be the battery they use on alot of Harley applications. They say this battery needs 14.20 volts minimum with a nominal charge voltage of 14.70 volts. Where are we going to get that kind of charging voltage. That means the battery is going to be 85% of charge most of the time.
On top of that it's only a 14 AH battery.
I really don't know what the answer is, especially if the bike has a single phase charging system.