The customer brought his car in saying that he was having a hard time starting the car. (humblemechanic.com)
This is a feature that I have to turn off every single time I start the car, because it is extremely frustrating to endure. (autolist.com)
My guess is what was going on is that the hybrid battery would get discharged after a day or two of not being used, and on hte next time I started the car, it would pull down the 12V starter battery while the DC / DC converter onboard was recharging the hybrid battery. (mechanics.stackexchange.com)