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?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. 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: 2010 Volkswagen Beetle Base 5 Cyl 2.50L Preventive Maintenance Fuel Filter- MIA or Doesn't have one Purchased a used 2010 VW b

According to the listings, there are two engine codes - BPR and BPS. Those equipped with the BPS engine have the fuel filter located under the vehicle, just ahead of the passenger side rear wheel. The BPR equipped vehicles have...

Q: If I set distributor to number 1 firing, then take the camshaft belt offset to top dead center, then put it back, would this effect my crank pully marks

Hello there, replacing the timing belt can be a complicated procedure. If the timing is off when the belt is removed, or if it is installed incorrectly, then engine damage can result. The cam and crank both have timing marks...

Q: A/C

Based on the information you provided, it sounds like you have a temperature blend door that is not operating. It could be the actuator or the blend door itself. If you would like to have this verified, have a qualified...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...