Do I Need A New Battery Or Alternator. Deciding to add an extra battery is dictated by the system and how it will be used and an alternator upgrade may be a more important consideration. A dead car battery can be one of the first indicators of a problem with the alternator.
Do I need a new alternator. If you recently replaced the battery. In some cases both parts may be faulty as a bad battery can reduce an alternators life expectancy and vice versa.
If you smell rotten eggs at the battery area it has hydrogen gas coming out and is very dangerous.
Once the car is running the alternator sends current back to recharge the battery as you drive. Testing the Alternator and the Battery for an Answer. If its in the 13- to 15-volt range your alternator is fine and you need a new battery. Do Big Stereos Need Extra Batteries.
