P0A80 code but doesn’t give any bad cells

I have a 2005 Prius. I drove it to work and as I was leaving the dashboard lit up with all sorts of warning lights including the dreaded red triangle. I had to leave it there for a couple of days until my boyfriend came to look at it. He drove it to autozone because he didn’t have his code reader. He turned the car off and when he came back outside, the car was completely normal again and said nothing was wrong.
We got it back to my house and had to leave it there for a couple days. This weekend all of the lights came back on. We took out the fan, which was relatively dirty and cleaned it out. But then we test drove it, turning it off and on a couple more times, and all the lights came back on. Then two more codes popped up C1310 (malfunction in HV system) and C1241 (abnormally low or high battery positive voltage). And we turned it off a couple more times and the C1310 went away. The fact that only the replace hybrid battery comes up makes me think it’s not that the whole thing needs to be replaced. When the lights are off and it’s not showing a code, the car is fine, drives normal, and it screen shows it charging normally. When the lights are on and it’s showing a code is when it acts weird.

 

I assumed that it was the battery, but then reading other people’s experiences, they said the code reader specifically said the certain cells were bad. The code reader only gives the replace hybrid battery. I just wasn’t sure if that really meant anything, like, if it could be something else.
Thank you for your reply! I will try those other things this weekend!