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I have noticed my 821 is getting harder to start in mornings even thought I ride during day. I put Battery Tender charge to it this evening and it says battery fully charged - why does it sound like battery getting weaker when I crank in morning for first ride?

 

[Buhgaboo]

How to Find a Parasitic Battery Drain

After you check for draw...if you don't find any...replace the battery

Battery life isn't a factor of time...it's a factor of use/abuse...if you charge it and still seems dead...it's dead....it's capacity has been compromised by something...you can low voltage charge...discharge over the course of a week...but it's hardly worth the effort...I would just replace it