Shumaker makes a $20 battery maintainer that's automatic and trickle charges a battery to 100% of it's capability. I own many - they use very little electricity but do need house current. Works awesome for even long stored batteries.
Now - if the car is outdoors and subject to weather driving it is suggested. Use brakes too as some get gun rust or worse fairly quickly and won't self correct without work if left too long.
Seals all over a car do much better also when used. They are everywhere and if those sit idle too long can create leaks,
T
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Tom Greenleaf - MetroWest, Boston