After four months, I finally received the battery I ordered on October 7, 2021. I am currently running it through it paces and recording everything that I find.
I have connected the battery to my FT-991A at my QTH, and am treating it like an off-grid power source. So far, everything looks great, and it seems like it will work pretty closely to the way I predicted.
One of my next steps it to also build a “box” to put the battery into, and make it more versatile.
Updates will be coming, shortly.