I got that same battery crimper set from amazon. Have you used it yet?
I will say I like them a lot. More so because I like having custom routed cables. Be careful when you crimp because it’s not a clean pinch. You end up with a pretty decent lip left over. I just hide it under the heat shrink.
Yeah I did some 4ga stuff for my camper batteries. Screwed up a couple crimps, but got it figured out.