To
determine how long your
battery will last,
calculate the
battery's total capacity and divide it by your circuit's power. Multiply the
battery's reserve capacity by 60. With a reserve capacity, for instance, of 120: 120 x 60 = 7,200.
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between three and five years
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Typically, a car battery will last between three and five years. Pushing a battery longer than five years, even under perfect driving conditions, could cause your battery to fail without notice. For that reason, many manufacturers recommend a replacement schedule of five years.