DTC P0A80 - replace whole hybrid battery or individual blocks?

I drive a 2010 Prius (around 200k miles) and the P0A80 code came up for the first time the other day. This was accompanied by multiple engine misfires.

Recorded Dr Prius readings during a short drive, screenshot attached, (delta SOC remained at 53% - and I'm noticing that block #11 displays low voltage consistently)

More background - the 12V battery reads 11.88V at rest and 14.76V when running - maybe an unrelated issue but replacing this battery/alternator could also be work that needs to be done. (Suspect a jump a couple months back might have contributed to this current issue with the hybrid battery.)

I'm interested in doing more research and salvaging this battery if possible - or at least putting in a new battery pack myself if that other work seems too involved for me (no experience with electrical work - but I cleaned the EGR system a couple years back with help from a friend). Getting the hybrid battery replacement done by a mechanic would basically total the car value x2.

Any input or direction toward relevant resources would be helpful! Thanks.