Battery Dead problems of the 2008 Toyota Prius

Defective engine required replacement prior to 139k miles (due to cylinder malfunction and excessive oil consumption), at a cost of $3700 for a used one. This has also damaged the catalytic converter, quoted at $900. At 149k miles, the hybrid battery has failed as well, which has a quoted replacement cost of $2400. While slightly outside of warranty, the engine and hybrid battery are both core components that are expected to last significantly longer. In carb states, Toyota even warrants the hybrid battery for 150k miles. The cost of replacing them exceeds the kbb value of the car, which is unacceptable for a 10 year old vehicle with average mileage that was properly maintained. I contacted both the dealership and manufacturer, and neither will accept any ownership in the matter, or provide assistance on repair costs.

I was driving 50mph when the car lost power. The car suddenly had no power brakes, no ability to easily steer, no engine power and many warning lights came on including an warning that the main hybrid battery was not charging. The car would not respond to acceleration. The car came to a stop. I held the start button the car shut off. The car restarted with no problems. All the warning lights were off. I put the car in drive and started to accelerate. All the warning lights come on just as before and the car suffers the same issues again. I went through the same process of turning the car off and turning it back on. The car started up again with no problems again, all the lights were off. It failed on more time on the trip home. I was able to restart the car and put my emergency lights on. I never drove over 25mph on the trip back to the house. My family took the car to wilson Toyota in bellingham wa. They examined the car and said the 12v battery had failed. They told my family that the main 12v battery runs all the electrical to get the car started and running. We told the dealer the car still had electrical power. They still replaced the 12v battery. The following day my family went to look at the car and a service person at the dealer, who said he was new to this location, said he had noticed that the 12v battery had seemed to be replaced recently. They said they would keep the car to keep looking over its systems. On 4/16/2015 my family called Toyota to discuss our safety concerns with regard to how the car failed. We explained we also have a 2007 Prius that had the main hybrid battery fail and that all the warning lights that came on were similar in both cars. The dealer has said there are no codes that said the main hybrid battery is failing. I am worried that I or my family could be seriously injured if the car failed in this manner again while on a busy highway or intersection.

After driving for about 500 miles the car was parked in the garage for two days. When I tried to start the car the 12v battery was dead. I used 3 different batteries to try to start the car. The lights came on on the dash but there was a warning message that there was a problem with the transmission and needed to put the car on a level surface which it already was, and the transmission would not come out of park and the motor would not start. The car could not be moved. When a new battery was installed the car resumed working fine. If the dead battery had happened when we were stopped on i81 because of construction, we would have been stuck in the fast lane with no way to move the car out of the travel lane until a tow truck arrived.