I have 2 of these M18 FUEL 4.5" / 5" angle grinders (model 2780-20 = bare model)


https://www.milwaukeetool.com/Products/Power-Tools/Metalworking/Grinders/2780-20

I use 5.0 batteries on them.

I like using the 5" wheel better = you can cut a little deeper, before you "bottom-out" against the angle grinder's drive hub. (the more common 4.5" wheels are easier to find and maybe a bit cheaper)

I do see Milwaukee has even some bigger diameter angle grinder, now-a-days, too. (6" or 9"; I believe)