I found my local battery place (like battery world type place) has euro types, USA ones, optima (get cables extended to suit cos Geezo, I loved my old Redtop! It lasted after years of bad treatment) , Bosch ones, so I will go to them next time.
I find great benefits from a
https://no.co/ unit that conditions and charges my spare and in car one. I will hook up the cables provided to allow quick connection in car to keep it nice.
Also, a capacitor jump starter, aldi had one but 4wd or auto online will have, carry it round just in case.