Two problems related to battery dead have been reported for the 2005 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota Prius based on all problems reported for the 2005 Prius.
The contact owns a 2005 Toyota Prius. While driving at various speeds, the vehicle accelerated independently and the hybrid battery warning light illuminated. The vehicle was taken to a dealer where it was diagnosed that the hybrid battery failed and caused the rpms to rev and the battery needed to the replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 140,000.
My Toyota Prius 2005 model had repeated and total failures when the 12 volpt sli battery was low, or in cold weather. The desigtgtn logic is very bad: when the sli battery fails, the back doors and trunk could not be unlocked, so I could not get my jumper cables out since all electrical controls failed. The car could not be towed from behind when parked, not to damage the synergy drive (apparently). I was told to buy a trickle charger since the sli battery died a few times while the Prius was garaged for more than a week. The Toyota sli battery is specialized, small and the contacts are too small to grab with normal jumper cables. There are too many single point failures initiated by a discharged battery. When my remote key battery died, I was totally locked out of the car. Mechanical backup options are needed for all these electrical and electronic controls.