Does it have any electric heat or is all of the heat coming off the engine?
I was pretty sure that the Prius has a DC to DC converter to keep the starting battery topped off, but that might be a better question for the dealership or a Prius forum or even the hymotion or other plug in conversion companies.
from a Toyota training manual regarding the 12V maintenance free battery:
Quote:
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This battery is very sensitive to high-voltage. When charging the auxiliary battery you should use the Toyota approved charger, because a standard battery charger does not have the proper voltage control and may damage the battery. If the approved charger is not available you may use a trickle charger if the amperage is kept below 3.5 A.
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