This is just to inform anyone needing it. Any questions comments, let me know To make a long story short, after error codes and car acting erratic it was determined to be a hybrid batter failure. Replacement from dealership was quoted $4000....After some research I went ahead with a remanufactured batter $1699, plus buy back on the old battery. After stripping the whole back half of the interior of the car I was able to get down to the battery and do the replacemement. I have to say, so far so good! Actually there are things I'm noticing were signs of battery problems before I even knew it. I notice this battery cycles the engine a lot less and increase in gas mileage. Battery also comes with a 18month warranty unlimited mileage. I live in Texas and drive quite a bit so we will see how my investment works out. If anyone has any questions or wanting to do this let me know and I'll help if I can. My prius is 2005 with 120k.