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Weak Car Battery Symptoms – What You Need To Know!

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To determine the main weak car battery symptoms in your vehicle, you need to know a few important aspects of your vehicle. Knowing what the car battery is, the car battery’s function, the main reasons behind the weak car battery symptoms, and the parts that could cause this issue in your car is important to the diagnosis of your vehicle!

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What‌ ‌is‌ ‌a‌ ‌car‌ ‌battery?‌ ‌

When‌ ‌it‌ ‌comes‌ ‌to‌ the high-level ‌functioning‌ of all components in ‌your‌ ‌car,‌ ‌the‌ ‌car‌ ‌battery‌ ‌is‌ ‌by‌ ‌far‌ ‌one‌ ‌of‌ ‌the‌ ‌most‌ ‌important‌ ‌internal‌ parts.‌ ‌The‌ ‌last‌ ‌thing‌ ‌any‌ ‌driver‌ ‌wants‌ ‌is‌ ‌to‌ ‌be‌ ‌left‌ ‌stranded‌ ‌on‌ ‌the‌ ‌side‌ ‌of‌ ‌the‌ ‌road‌ ‌with‌ ‌a‌ ‌dead‌ ‌battery, unable to move or figure out what is going on.‌ ‌


The‌ ‌battery‌ ‌is‌ ‌the‌ ‌power‌ ‌and‌ ‌the‌ ‌life‌ ‌of‌ ‌your‌ ‌car‌ ‌-‌ ‌without‌ ‌it,‌ ‌you‌ ‌wouldn’t‌ ‌be‌ ‌able‌ ‌to‌ ‌drive‌ ‌anywhere.‌ Not to mention, you will have an expensive repair or replacement for your weak car battery.  As a car owner, you need to keep in mind the importance of your battery when you are figuring out whether you want to spend the money to repair or replace this internal component. 

Car Battery Function

The‌ ‌car‌ ‌battery‌ ‌provides‌ ‌the‌ ‌necessary‌ ‌electricity‌ ‌to‌ ‌power‌ ‌every‌ ‌single‌ ‌one‌ ‌of‌ ‌the‌ ‌electrical‌ ‌

components‌ ‌within‌ ‌your‌ ‌vehicle.‌ ‌Without‌ ‌the‌ ‌‌battery‌ ‌power‌‌ ‌from‌ ‌the‌ ‌car’s‌ ‌internal‌ ‌battery,‌ ‌no‌ ‌

electrical‌ ‌component‌ ‌will‌ ‌work,‌ ‌like‌ ‌the‌ ‌lights,‌ ‌dashboard‌ ‌lights,‌ ‌or‌ ‌power‌ ‌windows.‌ If you realize your internal parts are not getting the necessary power to run at the right level, you need to look into the most common weak car battery symptoms. ‌ ‌


The‌ ‌chemical‌ ‌reaction‌ ‌occurs‌ ‌in‌ ‌the‌ ‌battery‌ ‌system,‌ ‌transforming‌ ‌the‌ ‌chemical‌ ‌energy‌ ‌into‌ ‌

the‌ ‌electrical‌ ‌energy‌ ‌necessary‌ ‌to‌ ‌deliver‌ ‌the‌ ‌right‌ ‌amperage‌ ‌of‌ ‌voltage‌ ‌to‌ ‌the‌ ‌starter.‌ ‌In‌ ‌

addition,‌ ‌the‌ ‌battery‌ ‌stabilizes‌ ‌the‌ ‌voltage‌ ‌to‌ ‌keep‌ ‌your‌ ‌engine‌ ‌running.‌ ‌


Without‌ ‌the‌ ‌battery,‌ ‌the‌ ‌car‌ ‌would‌ ‌not‌ ‌have‌ ‌the‌ ‌energy‌ ‌required‌ ‌to‌ ‌start‌ ‌and‌ ‌maintain‌ ‌the‌ ‌power‌ ‌to‌ ‌run‌ ‌your‌ ‌vehicle.‌ If the weak car battery symptoms prevent your car from giving the right amperage of voltage, you need to bring your car to a mechanic as soon as you can. Noticing the signs and symptoms of the weak car battery like a car owner can help you give your mechanic information that is necessary to diagnose and fix your vehicle.  ‌

Weak Car Battery Symptoms

Although some signs of a bad car battery are similar to that of a damaged alternator, some distinct differences can help you when troubleshooting and diagnosing the symptoms you are experiencing in your vehicle. 


  • Dim Headlights


If you find that your headlights are dim all of the time and do not get any brighter when you rev your engine, this is due to a dying battery that will soon be completely dead. When comparing the signs of a bad car battery vs. alternator, in this situation, the lights will not get any brighter after you drive your car and will stay at a suboptimal brightness for the entire drive.


  • Key Clicking Sound


When looking at the weak car battery symptoms, clicking sounds while you turn the key in the ignition is a sure sign of your vehicle’s battery issues. When you turn the key, the battery sends an electrical current to the starter solenoid to power up the vehicle. If the battery is dead, the solenoid will not receive the signal, and the starter will have less power to run the car.

Damaged Alternator

One reason for the car clicking sound and the weak car battery is directly related to a damaged alternator. What does it mean if you continuously hear this sound? Well, unfortunately, this could mean a damaged alternator. The car won’t be able to start if the alternator can’t provide enough voltage output necessary, with the only solution being to fix or replace the alternator.

Alternator Replacement Price 

To fix your weak car battery symptoms, sometimes you need to fix other parts as well – like the alternator. The average price to replace an alternator with a remanufactured part is approximately $400. A remanufactured alternator on a domestic car ranges from $300-$500, including the parts and labor/time required to install it. A new alternator’s price can be a lot pricier, ranging from about $500-$1,000, including the labor to install.


  • Slow Engine Cranking


Slow-cranking is usually the warning sign that your car is about to die, and you are experiencing weak car battery symptoms. If you notice this sign in your car when looking at the signs of a bad car battery, this is a vital symptom that your car battery is almost dead and needs to be repaired or replaced before your car dies completely.

Faulty Crankshaft Position Sensor

This is possibly the most common cause when it comes to your engine cranking, but your car won’t start. If the crankshaft position sensor isn’t working properly, it can cause the car’s internal computer – the engine control unit – not to function correctly. The engine’s computer is in charge of the crankshaft position sensor, so if it detects a problem, you will experience weak car battery symptoms. 

Damaged Fuel System

The fuel pump supplies the engine with the correct amount of gas for it to run properly. If the fuel pump is not working correctly, the engine won’t be able to run, and it will shut off. If the fuel pump, fuel injector, or fuel filter are damaged, the engine can slowly crank and the other weak car battery symptoms. 

Broken Engine Control Unit

The ECU is your car’s computer in charge of the various systems and functions, ensuring your vehicle runs smoothly. This engine control module controls actuators on the internal combustion engine to ensure the engine is running correctly. If there is an issue with your car’s ECU, you can lose power in your car. 


Typically, you will notice the check engine light on your dash. If you notice this light, it is a clear sign of slow engine cranking and other weak car battery symptoms. 


  • Engine Misfiring


Luckily for you and most drivers, this is a warning sign that is nearly impossible to miss. When looking at the weak car battery symptoms, a failing battery can cause intermittent sparks, leading to fuel build-up within the cylinders and causing engine backfiring. When your car misfires, this means that the internal combustion in your car is not working correctly. 


Even with the misfire, your car will still be able to run and function, but you might notice that the performance is subpar and leads to jerking while accelerating and problems with smooth driving. Diagnosing the cylinder misfire causes can reduce any performance issues and weak car battery symptoms. 

Improper Air to Fuel Ratio

An imbalanced air to fuel ratio in your engine can lead to the cylinder misfiring and weak car battery symptoms in your vehicle. If the air to fuel ratio is off within the engine, this leads to the wrong timing of internal combustion. If there is too much fuel or too much air in the engine, then the imbalanced ratio causes a cylinder misfire.

Ignition System

When determining the cylinder misfire causes, the ignition system should be one of the first places you look. There could be an issue from the spark plugs, ignition coils, ignition cables, or any seals and connections in the ignition system. If any of these problems are present, the internal combustion will not contain the proper air and fuel ratio and cause weak car battery symptoms.  

Mechanical System

Your vehicle consists of various mechanical parts that lead to the engine’s proper functioning. These main components are the piston rings, camshaft, cylinder valves, and cylinder walls. If one of these parts becomes damaged or worn down due to consistent use, this can lead to a cylinder misfire and weak car battery symptoms. 


Along with these parts succumbing to prolonged wear and tear, a blown head gasket, head gasket leak, or intake manifold gasket leak could be the cylinder misfire causes. A cylinder head gasket is in charge of sealing the engine block’s cylinders, preventing any liquids from leaking out of the engine, and preventing any contaminants from getting inside. If the gaskets are damaged, this could cause the cylinder misfire and weak car battery symptoms.


Finding out the top weak car battery symptoms and what causes these problems to originate in your vehicle can help you as the car owner and driver, prevent these signs from getting any worse, and causing irreversible performance determinants in your car. Noticing weak car battery symptoms not only enhances the lifespan and performance of your car but also keeps everyone on the road safe and responsible. 


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