Try a Westco battery, same technology as the Odyssey battery but cheaper and you don't have to mess around as it's a direct replacement.
I changed mine two weeks ago, starts with renewed vigor.
Got mine from www.tayna.co.uk delivered next day.
Cheers Stu
Stu
What is the reference number for this battery? The fitment guide doesn't have the 1200gs listed.
Cheers
Matt