Actually neither FORD or GM do prorate. Ford dropped it more than 3 yrs ago.I would say - given the track record with recent AGM battery longevity, it may be worth while to consider buying from a place with a true, non-pro-rated warranty.
There really are only about 3 main places that make batteries: Exide, East Penn (Deka) and JC (Now Clarios) are the more common ones I see - and most every battery you go to buy will be a white label from one of those three manufacturers.
Read the fine print - a lot of warranties on batteries are pretty loosey-goosey now-adays. Even/especially Costco. There are decent odds your battery won't last 5+ years anymore.
When I finally gave up on my Lithium, I went and dumped on an Autozone Duralast Platinum Elite - it's probably not any better than a cheap Wal-Mart special (supposedly a JC/Clarios battery), but if/when I have issues with it, it's got a 5 year 100% replacement warranty, rather than the pro-rated thing that most places are moving to.
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