easy_rider911:
Carlos from Spain:

 I have left the car sit for over 2-3 weeks on a few ocassions and never had a problem 


Same here ... touch wood Smiley

It's probably also a question of how the car is driven when it is being driven.
If the car is driven on long enough runs to fully charge the battery before it is parked for a couple of weeks, then you shouldn't experience problems. 
If the car is parked up for a while after doing short runs, particularly in winter when you use the lights and heater a lot more, the battery is already partly depleted when it is left in a cold place where its voltage drops even further. Then you can expect problems. 

It's no coincidence that batteries most frequently fail in cold weather, especially in the case of cars which are not driven every day. 


--

fritz