Your car battery can die for two major reasons: Either the battery is dead because it’s old, or the alternator is not charging. When you come in with a dead battery, we charge the battery to see if it will hold a charge. We then check the charging system to ensure the alternator is charging the battery.
If the alternator is not charging, we will need to replace the alternator. We then make sure the battery has a full charge and that it will hold the charge. In some cases, the non-charging alternator could be the last straw for an older battery. In that case, we would need to replace the alternator and the battery. If the battery holds a charge, then we only replace the alternator.
If the battery is dead and the alternator is charging, we only replace the battery.
In some cases, your battery might not start the vehicle because the battery terminals are corroded or because the positive and negative battery cables are damaged. We clean the terminals as part of replacing the battery. However, if the battery has a full charge and the alternator is charging properly, we will look at the cables, which might need replacement.