I have owned 2 Smart cars (2008, 2017). I changed the battery out 2x on the 2008, but the 2017....They moved the battery to under the front hood and it appears that you have to remove some vent cowling to get it out. Plus, the fancy EFB battery which can supposedly be replaced with a AGM is rare. The dealer does not have this. Checking out all the auto dealers and battery people, they stop the offer of the battery options at 2016. So has anyone replaced the battery with an AGM and is removing the cowling area the only concern. No Youtube videos out there on this either. (except the dorky one where for 15 secs, they take the front hood off and point at the location of the battery - thanks Einstein) Right now I have a 3000 lb paper weight outside. Only 1 vendor appears to offer a AGM of that size and terminals location, but concerned to make a move before I know I am committed.