Signs Your Car Battery Is Dying
Eight warning signs
- Slow cranking. The engine turns over sluggishly, with a dragging sound, before it starts.
- Clicking instead of starting. A rapid clicking means there is not enough power to engage the starter.
- Dim headlights and interior lights, especially at idle or when you start the car.
- Electrical oddities: power windows that are slow, a radio that resets, or a dashboard that flickers.
- The battery or check-engine light on the dash.
- White or blue-green corrosion on the terminals.
- A swollen or leaking case. Heat can make the case bulge. A swollen battery should be replaced promptly.
- Age. A battery older than three years deserves a yearly test, and one near five years is living on borrowed time.
Why batteries fail earlier in Maryland than people expect
People assume cold weather kills batteries, and it does expose weak ones, because cold thickens engine oil and cuts a battery's output at the moment the engine needs the most power. But heat does the actual damage. Hot, humid Maryland summers accelerate internal corrosion and cause the electrolyte to evaporate. The battery is weakened in July and finished off by the first hard freeze in January. That is why many batteries seem to fail on the first cold morning of winter when the damage was done months earlier.
How a battery is tested
A quick test tells you far more than guessing. With the engine off, a healthy fully charged 12-volt battery reads about 12.6 volts. A reading near 12.4 volts means it is about 75 percent charged, and 12.0 volts or less means it is substantially discharged. A load test goes further: it simulates starting the engine and shows whether the battery can hold its voltage under demand. A battery can show a healthy resting voltage and still fail the load test, which is why a proper test is worth more than a voltmeter glance.
The U.S. Department of Energy and most automakers treat batteries as a wear item that should be tested annually once they are a few years old.
Is it the battery or the alternator?
The two are easy to confuse. The battery starts the car, and the alternator recharges the battery and powers the electrical system while the engine runs. If the car starts after a jump but dies soon after, the alternator is a prime suspect. If the car will not start at all but runs fine once jumped and stays running, the battery is more likely. A quick voltage test with the engine running, which should show roughly 13.7 to 14.7 volts at the battery, separates the two.
What to do if you suspect a weak battery
Do not wait for it to die in a parking lot. Have it tested, and if it fails, replace it. Replacement is a short job that can be done wherever the car is parked. Our mobile battery replacement service comes to you in Parkville, tests the charging system at the same time, and disposes of the old battery properly. Keep the terminals clean, make sure the battery is secured in its tray, and take a longer drive now and then, since many short trips never fully recharge a battery.
Car won't start in Parkville, MD? Parkville Mobile Auto tests and replaces batteries on site.
Call (443) 332-3393 Contact Us OnlineFrequently asked questions
How long does a car battery last?
Most car batteries last three to five years. Heat, short trips, and heavy electrical loads can shorten that.
What does a dying car battery sound like?
Usually a slow, labored crank or a rapid clicking sound when you turn the key.
Can a car battery die without warning?
Yes, although weak batteries usually give hints such as slow cranking and dim lights. Yearly testing after year three catches most failures early.
Is it the battery or the alternator?
If the car starts with a jump but dies shortly after, suspect the alternator. If it stays running after a jump and will not start later, suspect the battery.
Can someone replace my battery at my home in Parkville, MD?
Yes. Parkville Mobile Auto tests and replaces car batteries at your location. Call (443) 332-3393.