I'm suspect of the AH rating of batteries. If you look at the Exide site, from the dimensions of their batteries they make for BMW, most of them are rated 12 AH @ 10hrs. They don't list the cold-cranking amps either for some reason.
Anyhoo, this is what I learned way back when mine crapped out after maybe 1 1/2 years on this site.
"I was just looking at the Exide battery website. Looks like their Free Replacement period is only 6 months for motorcycle batteries, whereas Odyssey is 2 years free replacement on motorcycles. The stock battery weight is around 4 pounds less than the Odyssey too.
Also, at the end of the Odyssey specs page (LINK
) I noted that without the metal jacket, the battery range is -40 to 113 degrees F. With the metal jacket it bumps up to -40 to 176 degrees F. Big difference. I'm sure that a battery under a closed fairing and sitting atop a K1200 engine is going to get hotter than 113 degrees F. No wonder the stocker crapped out so early (actually 19 months must be pretty good if Exide warranties it for free replacement within 6 months). Heck, it gets that hot around here in the summer to cook a battery without firing the bike up! Glad I left the metal jacket on."
Another site lists the detrimental damage done to a battery increases for every 15 degrees F in temp above their max. ratings range. The metal jacket on the Odyssey raises that by 63 degrees!
Also, I believe BMW was replacing a lot of batteries on some new bikes not that long ago.
So far, mine spins right up now and doesn't do what yours is now doing - which it used to.