So here is the OEM battery from my 2017 Mazda 6 (2.5l Petrol)
This lasted just over 5 years
I turn off the iStop Start whenever I remember.
Most of the driving is short trips around suburbia.
Changing the battery removed the positive terminal first.
Trip details was lost.
Bluetooth settings didn’t appear to be lost.
I reset the iStop after the new battery (there is a process apparently). Not sure if it was working before that or not.
OEM Battery that was in my vehicle (see images below). Please note that this may vary from country (this car was purchased in Australia) and car specification:
GSYUASA (Or GS YUASA?) Made in Japan
Q85
65Ah
CCA 520A
D32 (JIS)