Some Japanese cars are fitted with small warm weather batteries, quite unsuited to the UK climate - the original battery in my Subaru Outback was a small Panasonic and failed during it's second UK winter - I replaced it with the biggest Bosch that would fit the battery tray and all was fine.
In my view, the OEM batteries fitted (I've had three Mazda ones in 18 years, plus my current one is also a Bosch and higher output, fitted this time by the RAC at the end of the first lockdown in 2020) to my Mazda 3, and none of the OEMs have lasted more than 4-5 years.
The current Bosch one (now 3.5 years old) was first 'tested' 5 months after it was fitted, and that time and at every subsequent service around this time the dealer says the 'state of health' has been poor and recommended it be replaced.
Oddly enough, the Bosch battery (which is I think 650CCA as opposed to the OEMs' at 450 or 550) has never missed a beat starting up in all weathers, even in really cold winter weather and when not used for a fortnight. The OEMs always struggled after a year or two in that sort of conditions.
Makes me think about the ethics of my dealership and/or engineering prowess of Mazda sometimes, especially in the light my car's (expensive) current issues with one of its exhaust sensors.
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