Starting difficulties may develop, mostly noted if the car has been parked for several days. Toyota has changed the 12v battery size specification to help correct this concern. Our technicians tell us the battery tray will need to be replaced to accommodate the larger battery
Hard Starting If Car Has Been Sitting Several Days on Toyota Prius
Average mileage: 11,850 (11,700–12,000)
6 people reported this problem
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I drive my new Prius daily so I never notice this problem. We recently took a vacation and park our Prius in the parking garage for just 3-4 days. I had double check to make sure everything is off before head off for vacation so I know it is not from any light that was left on. When we came back my 2013 will not start and need a jump. Technician who helped to jump our car indicated he helped many Prius that has the same problem. I like my Prius but if I have to pay to jump my Prius every time I take a vacation (not a long one at that), this is a major problem. Hopefully there is a fix for this.
Battery on new car kept going dead even after sitting overnight. After it was towed to the dealer twice, they informed me that I should start it and let it run in my garage for 30 minutes if not driving it daily. Subsequently they decided the battery was defective and replaced it.