Q: Why does a car battery stay full and ready even when the car is not in use and the ignition switch is off?

asked by on

Already have.

My car has 93000 miles.
My car has an automatic transmission.

A battery uses basically lead and lead acid to cause a chemical reaction that produces the required voltage that a vehicle uses to run the vehicle electrical systems. The amount of material put into the battery when it was made will allow a vehicle battery to store and produce the required voltage needed to sustain a vehicles electrical system for about 3 to 5 years before a replacement battery is needed. Here is a very good explanation of how a battery works with a car’s electrical 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
  1. Home
  2. Questions
  3. Why does a car battery stay full and ready even when the car is not in use and the ignition switch is off?

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: My car turn off while driving but starts bak up right away no service engine lights on.

Hi there. Either the Ignition Module, Crankshaft Position Sensor, or PCM (Engine Computer) is acting up on your vehicle. An ignition module will cause the engine to shut off when it gets hot. The engine will shut off if the...

Q: I have a 1988 Chrysler Fifth Ave,everything under the hood was wet now it's been 3days and still won't start

Excessive moisture and, worse, liquid water, all over the engine will cause electrical components to malfunction. The engine should be inspected to determine if it can be "dried out" and to determine which connectors and components need to be removed...

Q: Engine unable to run as it should

This is most likely from the fuel filter is clogged or the fuel pump needs to be replaced. The fuel pump may loose pressure from a clogged fuel filter which causes the pump to not build up enough pressure to...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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.