For the Ampera (similar to, but better than a Prius :-) ) the owners handbook suggests disconnecting the 12v battery if being left for extended periods.
The manual doesn't mention Transport mode, which is used to put it into a sleep mode for overseas shipment ( - all Amperas were built in a specialist plant in the States). You put it into this state by a combination of starting the ICE, putting on the hazards, pressing the brake pedal and pressing the start button.
The user group also recommends using a trickle charger as an alternative - some use solar chargers.
The recommendation is also to leave the main battery less than half charged, though I feel I've seen that questioned somewhere.
I didn't do any of these when I left mine at the airport, because I forgot.
If the 12v is flat you just jump it like you would an old-fashioned car. :-)
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