HV battery cell replace advice!!

I'm brand new to hybrids and Prius and I got a gen 1 Prius that had been sitting for about a month and a half. Had a bad 02 sensor when I checked the code and needed a new 12v battery, but ran with a jump, drove good. so I grabbed it for $800. 300 miles later I got code 3006 (of course.) I've done a lot of research and watched YouTube videos. I got Dr Prius, and it looks like #6 is the bad cells. I also load tested, had the engine charge battery and put in neutral and turned on max AC (which works) headlights on bright, radio, and car stereo. Let it drain the battery then put back in park to charge. I have a video of it. At no point did it only run on the HV battery. If someone could take a look at the video I'd so appreciate it maybe you see something that a novice is totally missing, especially with the recharge.

 

Video didn't upload trying to reformat. Here's some picture of biggest changes I saw first image is what it sat at before load testing, second is with headlights on and max AC blasting in neutral. Last 3 are back in park recharging (those 3 pics are about 15-20 seconds apart) and the last is what it sat at after recharging for awhile