Is my battery on it's way out.....

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Hi,


My Fazer is 9years old this year it's a 2003 foxeye FZS600.


Going strong but the last few mornings I have switched the bike on started it up, all ok. Then while getting my gloves on there is the rattle chatter from under the seat. As if the relay is cutting in/out.


The bike is still running give it some revs and the chatter under the seat goes away.


The bike is on an optimate at least one night over the weekend usually Sunday night.


I ride all year round so the bike is on the road a lot.


So is my battery on it's way out and not holding charge properly.


A couple of weeks ago I left the headlights ON for 10-15minutes with the engine not running.


Then when I came to start it I got the full on chatter under the seat so I knew there wasn't enough charge in the battery to start the bike.


Put it on the optimate over night and the bike has been fine until now.


So have I possibly damaged the battery.


This is the 2nd battery and probably getting on for 4years old.


But it's regularly on the optimate.


So am I looking at the death throws of a soon to be duff battery.


Cheers,