Batteries usually last several years. But the more important note is that after driving your car, the voltage will probably always read 11-12 or so. Even if a battery has low charge capacity, the inital voltage will be near normal levels, unless the battery is really on it's last legs, where it wont hold a charge at all. Same goes for voltage during driving - the alternator is constantly charging the battery to full.
My last car had a battery that lasted 4.5 years. ^^
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2012 Pearl White 370Z GReddy Twin Turbo
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