My 2004 owners manual states car can be parked for a year without any extra care being taken with the main battery supply. 12 volt should last several months and car can be easily started as long as there is any spark at all to fire up ecm.
Battery tenders are available every where and one that is failsafe starts at $54.00. I leave one connected permanantly to my pickup which spends the winter in a carport with little use. I've used itr successfully for 10 yrs. This is just for info. I still believe if you have shelter you can park a Prius all winter without use and not do nothing to it. This I have determined from Toytota info.
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