A battery only requires a little monthly maintenance to perform perfectly. Keep the battery charged to 100%, recharging when the lights dim, the starter sounds weak, or the battery hasn't been used in more than two weeks. Other than that, follow this simple check list every month:
Finish up by testing the battery with either a hydrometer or voltmeter. To extend the service life of your battery, make monthly battery maintenance part of your routine.
If the vehicle is in storage or used infrequently, disconnect the battery cable to eliminate drain from electrical equipment. Charge the battery every two weeks.
For extended storage, remove the battery from the vehicle and charge to 100%. Charge the battery every month if stored at temperatures below 60° F. If stored in a warm area (above 60° F), charge every two weeks. Make sure batteries are stored out of reach of children.