My 11 month old Mazda 2 battery failed. Daily driver, garaged every night. Japanese manufactured battery. Had to be pulled onto a breakdown truck and returned to the dealer for a new battery under warranty. Very disappointing. Never had a car that left me stranded in over 45 years of car ownership. My 13 year old Avensis, sold to a relative, is still on its original battery and 130k miles.
The former would be a car with a stop-start sytem, so perhaps it could have been part of the issue. I'd also have the electrics checked to see if there wasn't an unwanted constant drain on the system like a boot light or such n such. Far more systems on modern cars than a 13yo Avensis. As you say, as it's a warranty issue, the cause needs to be identified and rectified asap.
This time around, I had to have my 16yo Mazda3's battery replaced via an RAC callout rather than the dealership (knwoing it was on the way out) just after the end of lockdown in summer 2020, and I've now got a Bosch battery and of a higher capacity than the three previous Mazda batteries fitted. It apparently also comes with a 4 year warranty.
I also had spells of using my car as a daily driver to work over reasonable distances, others, like the last few years, with hardly any use, but where the trips are of a reasonable length (10-15 miles each way or more), and yet each battery has lasted about the same time: 4-5ish years. Ironically this last one lasted the longest of the three...
As others have said, some otherwise bog-standard batteries appear to last a very long time in a car (like my parents' Fiesta) which the usage pattern says no, and yet yours should mean it's in good condition, and yet...
For me, the lack of consistency over and predictability of battery life is a major disappointment in modern motoring.
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