Straight from the Odyssey Warranty document:
"The warranty does not cover a Battery reaching its normal end of life which may occur prior to the warranty periods stated above. Depending on the
application, a Battery can reach its normal end of life before the end of the Applicable Warranty Period. A Battery can deliver only a fixed number of
usable amp-hours over its lifetime and is considered to have reached its normal end of life if the application uses up all of these amp-hours, regardless
of the time the Battery has been in service. Therefore, Manufacturer reserves the right to deny a warranty claim if it determines the Battery to be at
its normal end of life, even if the claim is filed within the Applicable Warranty Period."
This is what they pulled after three emails and four phone calls to Odyssey's claims department. Yes, it did take that long to receive a response. So basically the above verbiage is a catch-all for any battery they decide they don't want to replace. Infuriating. So just want to make sure you all don't make my mistake and neglect the "fine print".
With regards to the AGL charge rates, that's good advice. I only would like to point out that my Optimas over many years (also AGM) have always lasted. Kept hearing about a decline in quality and that is why I went to Odyssey. Big mistake!!