I understand where you are coming from. I don't have a battery maintainer but use a regular battery charger and put it on low charge when the weather is really cold or if I am going away for a week at a time then I charge it up for about 6 hours before leaving.
I use my car pretty much every second day. I believe that if you disconnect the battery then you need the radio code after you reconnect the battery. What else you lose I don't know.
Another thing I have started doing lately especially in winter is to unlatch the front trunk so if the battery goes flat then I have easy access to the battery. For security the car is in the garage so it does not matter if the trunk is unlocked for me.
I have never had trouble starting the car even though I have been away from the car at least a week. A lot depends on the condition of the battery and how often it is driven.
Cheers, Guy.
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