As far as the optimate goes, good as it is, it does not know the AH capacity of a battery. Treated well, a battery will give good service over a long period, but its capacity will reduce. However, the optimate wont spot a problem if it follows the rules and takes a charge.
Wait until its charged up on the optimate, then turn your lights full on for a good minute. They should not significantly diminish, and the bike should still start afterwards - otherwise suspect your battery, which if 6 years old has done you proud.
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