I have 2 CTEK chargers in my garage and I ALWAYS connect my vehicles to them,. EVEN if I'm just gonna disconnect thewires again in 12 hours. With the alligator clips its so fast and takes a minute to put on and turn on, or to take off. AND then it gets charged while not being driven. win win. Batts never die.
My e53 batt is 11 years old and as strong as the day it started the X5 the first time.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S