I have a 2015.5 XC60 with auto start/stop. The main battery is 800A, and I was just recently made aware of the auxiliary battery, with is 170A. So that's 970A total. I also have a 2021 Toyota Highlander, also with start/stop. It's a bigger SUV than the XC60 and with a bigger engine (3.5L v6). However, it only has a 605A battery. Why does the XC60 need so much more battery capacity than the Toyota Highlander?

 

Sorry, this is a duplicate thread. The moderator can delete it.