P0A80 after "B" mode

Recently a red triangle appeared on our car's dashboard - it happened after my husband used "B" mode for a short time. I checked codes using Car Scanner and that's what we got:

P0A80
Hybrid battery pack Deterioration

P0517
Battery temperature sensor - circuit high

First thing we did was checking hybrid cooling fan if it's not dirty or clogged - it was pretty clean and it looks like it works well. After that, codes disappeared but after a few days P0A80 came back (this time none of us used "B" mode).

A few months ago we replaced a battery for a refurbished one from a place that seemed to be a good one in our area. We replaced it because a red triangle appeared, and the mechanic told us we need to replace it. What's funny, it happened right after my husband used "B" mode.

So yesterday I run a test using Dr Prius and it looks like we need a new battery soon (this time we're doing a new one). It looks like the battery doesn't have much capacity left (I did this test twice and got a very similar result), delta soc is high and block #1 is always the tallest on a diagram (I don't know if that even matters now).

But I wonder, why both times when my husband used "B" mode for a very short time, we got battery issues? Do you have any idea if there's anything else that may causing battery issues and P0A80 code? Or is it's just weird coincidence that he used that mode twice, and each time red triangle appeared? I just want to avoid a situation when we buy a new battery, but next time one of us uses "B" mode, something happens to the battery again.