Q: Q: Why does my battery keep dying?

asked by on

My car battery went flat i charged the battery and it was fine after using it for a few days it went flat again, the battery only 12 months old iv had the battery and alternator test and they are both fine

My car has 90000 miles.
My car has a manual transmission.

This may be a sign of a failing voltage regulator. As you know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator. The voltage regulator is a unit that regulates the charging of the battery by the alternator. Often times when the voltage regulator is not working properly, this will result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely destroying the battery. I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Why does my battery keep dying?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Keyless ignition not working.

Hello. This is a common problem on your car. It is so common that Volkswagen has a technical bulletin for this. The fix is replacing the Start Module. This is best left done to the dealer as it will need...

Q: windshield wipers motor not working

Hello, thank you for writing in. The issue is likely related to the switch and the ground. You may want to access a wiring diagram of the system to better understand. The power supply is always available at the wiper...

Q: Car idles rough when in gear

Hello. If the idle is that low, then it can be caused by a number of things. Most of the time it is caused by a vacuum leak or a dirty throttle body. The throttle body being the most common....

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.