Hard Starting If Car Has Been Sitting Several Days on Toyota Prius

Problem Description and Possible Solution

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

Problem Data
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Average mileage: 11,850 (11,700–12,000)
6 model years affected: 2001, 2002, 2003, 2008, more2012, 2013
9 people reported this problem
Viewing 1 - 3 of 3 comments
Haven't driven for a few days, it's been cold. Went out yesterday to take the car to town and it never let the ready light on, then it read that there was a problem with the car not coming out of park and still wouldn't work. Left the car.. went out this morning and it started right up.. went out this afternoon to again go to town and same thing as yesterday and now the battery is dead. What to do?
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.