Quote:
Originally Posted by RobertSmalls
The DC/DC converter runs until the high voltage battery is almost empty, then it thankfully shuts off and allows the 12V battery to deplete itself.
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Actually, it doesn't work that way, at least in my experience. If you have ignition or ACC on, the 12-volt battery can drain even though the IMA battery stays fully charged, at which point you can't start the car even by push-starting.
That's also a reason to keep an eye on the state of the 12-volt. If it gradually goes bad, you won't notice in normal driving, until one night you see the DC/DC converter stops working, the engine starts misfiring, and you coast to a stop. New 12-volt battery, and problem goes away.