the battery need to be charged and floated when not in use. especially if your car is a hobby car like mine it needs to be on a battery manager (battery tender) during the week or during hibernation.
my dd (G35C) is also on battery manager on the weekends. my short 22mile round trip commute (where half is bumper to bumper) is not enough to charge the battery. my car is 7.5yrs old and still running factory battery.
