Alternative Replacement Battery recommendations
 

I have a 2016 S80 and need a replacement battery. Volvo lists the battery as AGM H7 800 CCA. The H7 size does not seem to be carried by a wide variety of outlets, e.g auto stores, 'club stores' etc.
I did some searching and supposedly 94R and H7 are equivalent and that H7 and H6 are interchangeable.
Can anyone verify this?
Also, recommendations of alternative battery sizes and brands are desired...( even though essentially 3 battery mfg supply almost all the vehicle batteries in the US)
Thanks
j

Last two batteries I bought via Napa Online using their exact fit recommendation. They happen to list both the 94R and a size 48 with a caveot about venting the battery due to the car having start/stop. You can also go OEM - Tasca Parts shows the 800 CCA for $206, which is competitive to auto-store prices.

Auto zone has a H7 and H6 listing, interstate battery has a listing - what stores do you have near you?

I've never had a problem finding an H7 although I have refused a couple because they didn't have the proper vent tube.