You don't say where you live but ideally a trickle charger is optimum. Failing that my 2001 Box base sits for a week at a time in the winter uncharged in -20C or around -5F when we go away on holidays a couple of times in winter.
In the 2.5 years of ownership the car has never failed to start after a week of sitting. Whether this applies to your 2010 I don't know. I have manual key only so getting into a locked car is not a problem and as long as I have power I can get into the front trunk. Obviously a good long run before you put it away and after you are done is recommended. Trust this helps.
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