A bad or weak starting battery causes additional stress on a charging system, starter motor or stater solenoid. It can cause premature failures due to compensating for the voltage or current. If you replace a battery, alternator, voltage regulator or starter, you should test other components for damage and repair or replace them as required.                                            WHAT CAUSES CAR BATTERIES TO FAIL!                                                                             Driving habits rather than battery defect may be the cause.