I'd be happy to do a short review of the tester. First impression see below
I think nowadays all batteries are maintenance free and sealed, even the standard flodded ones. At least I haven't seen one where you can actually open the cells, in 20 years

Also the tester wants to now if it's "regular" (flooded), AGM flat plate, AGM spiral, gel or EFB
BUT it has a quick test mode, where it doesn't ask for the type and I just guessed the CCA:

- C3_test1.png (138.1 KiB) Viewed 24 times
It's a
Motopower MP0515A, and so far looks well worth the money.