I hope to be able to put a larger battery in my car when i get to try parking guard too, not really as i will be needing it as i will only do parking guard for 30 minutes normally and maybe a couple of hours now and then.
But my little Suzuki are from 2012 so a now battery will not harm i am sure, must also be cheap batteries in cheap cars to make ends meet for the maker.
Still recording for that long and often, that will put a strain on any car battery, they are after all not really meant to be discharged deep like that, for that you will need deep cycle batteries which i think are a whole other price bracket.