Help: P08A0 Hybrid battery pack deterioration

I Have a 2006 Prius with trouble code P08A0 Hybrid battery pack deterioration.


This code appeared pretty suddenly, id say I noticed Some symptoms for about 2-3 days, where the engine would turn on at random moments, and the battery charged and discharged very quickly, and inaccurately showed charge levels. Coolant and oil levels all normal. Oil Changed about 1000 miles/2 month ago.

A few other unusual things I noticed:

Its been cold and I turn on my heater to max, 2 days ago I started smelling a burning electrical smell, this smell now shows up every time I turn on the heater. (Please Note that I'm not 100% sure its a electrical burning smell but if I had to guess that's what I'd describe it as.)
When I Open the hood after driving, i can smell the same burning odor.

After I turn my car off, I hear a hum for about 5 seconds. The car always makes sounds after i turn it off so I wasn't sure if I just didn't notice it before. I think its a bit louder than usual. (This sound is not the coolant control valve, which I'm familiar With and had replaced about 6 months ago.)

I Tried clearing the code with a scanner, and it stays off for the trip until I restart the car.

When the code is cleared, hybrid battery still has the same quick charge/discharge problem, and the engine stays on even when completely stopped / in park.

While in park, the hybrid battery Drains rapidly and the engine comes on every 5-10 seconds. For just a few seconds.

A few other notes:

I recently washed my car, which I haven't done since buying it used 1 year ago. I didn't do anything crazy, just a normal exterior wash, the only difference was I used a low power electric power washer. Not 100% sure but this feels like it may have started after I washed it.

Previously just a few days before this started, I was still getting 42-44 Mpg per fill (calculated by miles and gallons, not MDF display value). From what I've read online, usually I'll start getting worse mileage gradually and hybrid battery failure usually doesn't happen this fast.

Thank you for any help/advice.

 

is that what the smell is coming from as well? the hybrid battery failing can cause it?

 

are there any companies that still offer a lifetime warranty on the battery? i only have about 120k miles on it.

i also ran it with pro torque and only 1 of the cells is bad. what would you recommend?

ill add a screenshot of the page. the 12v seems low as well. this picture is after driving about 5 miles local around 30-40 mph. maybe 30 mins round trip to and from work.

 

charging and discharging varries, but the light comes back on around 10-15 mins of local driving.

Also yesterday, the rear battery fan (behind passenger seat) got really loud as if it was blowing/sucking in air really hard. I was just a few blocks from home so i got back, but when i scanned, i got another code (P3017) I think.

I dont mind getting another battery, i just want to make sure its the battery and not the inverter pump or anything.

Also, if anyone has any current reccomendations on where to buy one, id highly appreciate advice. Right now im looking at this company. Greentec Auto | EV and Hybrid Battery Replacement

off topic: ive been asking for quotes on the traction battery... and most mechanics so far dont know what that is., they keep asking if i mean the 12v... is it not called the traction batter?!?!