Dead battery on car.

The battery is dead, so I cannot start my engine at all.
Experienced mechanics share their insights in answering this question :
The battery is a key component for the car to start. The car uses the battery at start up to provide power to the starter. Once the car starts the alternator takes over the job of supplying the car with the electricity needed to to run. If the alternator fails the car simply takes the electricity it needs to run from the battery until it drains it. So a dead battery can just be a dead battery because it simply wont hold a charge anymore, or it can be dead because something drained it. A mechanic should be able to test your battery to see if it needs to be replaced.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The Engine Starts Very Slowly

This is because the battery`s purpose is to provide energy to your car`s starting motor, which then starts the engine. If your BMW`s battery has insufficient power, it can cause your engine to start much slower than usual.

A dying car battery can create weak sparks that cause fuel to gather in an engine`s cylinders. Once this built-up fuel is ignited, it reacts with force, which can cause your car`s engine to backfire. A backfiring engine may be a sign of a battery that`s on its last legs.
If your car won`t start but the battery is good, the most common cause is a faulty starter – though it could also be to do with your fuel. You may have insufficient fuel to get the car going.
Sometimes a vehicle starts, but instead of idling, the engine immediately dies. In this case, the battery`s charge may be just enough to turn over the engine. However, the battery then fails, causing disruptions in the signals sent to the engine control module (ECM), and the engine then dies.
Internal components: A weak battery affects performance by causing damage to the engine`s internal parts. The low voltage causes the temperature to go up, and overheating can result, which causes damage to the engine parts.
A faulty ignition coil could also be related to a battery that has abnormally low or high voltage. A bad battery can cause a huge range of additional issues with your vehicle. Sometimes, the issues can be remedied by replacing your battery but your vehicle may also need an ignition coil to be replaced.
The basic components in the ignition system are a storage battery, an induction coil, a device to produce timed high-voltage discharges from the induction coil, a distributor, and a set of spark plugs.
If you don`t hear clicking when you start the engine, the problem may be a dead battery. If you hear clicking, but the engine doesn`t crank, the starter might not be getting enough electricity. Using your owner`s manual and a voltmeter, you should be able to test functionality.
Bad Sensors

One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft. The computer uses the information from this sensor to know when to fire the spark plugs. If the sensor isn`t working, the spark plugs won`t fire, keeping the engine from starting.

If your battery is sulfated, which results in low power and difficulty in recharging to full capacity, it can sometimes be recovered using proper pulse charging techniques. Wehmeyer warns, however, that there are an infinite variety of pulse charging techniques used by a wide variety of equipment sold for this purpose.
Maybe you`ve noticed signs that your battery is dying but haven`t had time to resolve the issue. If your battery fails to charge while driving, but the alternator is functioning properly, the car may continue running while in transit. However, you may not be able to start your vehicle after it`s powered off.
So, you are wondering how to start your dead car battery without another vehicle. Boosting is usually the first option that comes to mind when your car battery dies. But you will require jumper cables and another running vehicle with a functional battery to jump-start your car.
What if your car won`t jump-start? First, try running the other engine for five more minutes before trying again to start yours. If your car still doesn`t start, you may need a new battery — or it could be a sign of a more serious problem.
Hard Starts and Stalling

If an ignition coil is malfunctioning and not delivering the required voltage to the spark plugs, you will find it hard to start the engine. If your vehicle stalls when you stop and even shut off completely, it could be a bad ignition coil sending irregular sparks to the spark plugs.

The battery used in this system is the rechargeable lead-acid battery that stores electrical energy. The ignition system is powered by the battery which supplies current to it as soon as the engine is running.
A conventional ignition system has 5 main parts which include: Battery – The battery provides the electric current that ultimately starts the engine. Ignition Switch – Also known as a starter, this component activates the main electrical components of a vehicle.
The ECM controls the ignition system and distributes the electrical power to each individual cylinder. The ignition system must provide sufficient spark at the right cylinder at the precise time and do it frequently. The slightest error in timing will cause engine performance issues.
A dead battery in your key fob means it can`t broadcast the signal the ignition system is looking for. If your car or truck can`t detect the correct signal, then the ignition will remain locked, and you won`t be able to start your car with the fob in your pocket.
It might be a faulty starter.

One of the symptoms of a bad starter is a single clicking noise when you turn the key or push the start button. Tapping the starter can sometimes get it going again, but no guarantees. Most likely, you`ll need to get your starter repaired or replaced.

The O2 sensor will not cause the no start. The no start can be caused by the fuel pump or the ignition system. You should check the engine for spark and fuel pressure, when it is not turning on to help narrow the problem down. The ignition system may be the coil, module, or pick up in the distributor.
Since any engine requires the correct air to fuel ratio and ignition timing to start, having a faulty sensor that can`t adjust these symptoms on the fly can cause the engine to not start.
The ignition relay is one of the most important electronic relays found on modern vehicles. It is usually located in the fuse and relay panel beneath the hood, and is responsible for providing power to the vehicle`s ignition system, and some of the fuel system`s components.
Your BMW may not start due to a blown fuse or a bad relay. Checking the fuses on a BMW is very easy. You can remove the fuse and visually inspect the fuses. You can also check with a digital multimeter.
Push and Start

The idea here is to switch the car to neutral and accelerate it along the road by pushing. Once, the car has gained sufficient momentum, engage the second gear and turn on the ignition. This will surely start the engine, and soon the car battery will come to life.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Water was spilled in the trunk which soaked the car battery. Car won’t start now. Does water destroy a car battery?
ANSWER : Hi, thanks for writing in about the concern with the BMW 320i. If the battery was submerged in water then it’s completely possible for the battery to short out and die. Your friend will need to have the battery replaced. Also be sure to get all of the water out of the trunk. Have a certified technician, like one from YourMechanic, help you guys out if you need assistance with replacing the battery. Good luck.

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When changing the car battery, do you "register" the battery to the car computer?
ANSWER : Hi there. Changing the battery has nothing to do with programming a battery. If the car was flat dead with a battery that lost all of the power because the dome light was on, then when jumped the vehicle will run fine. What may need programmed when the battery is replaced is the key fob. The key fob will lose programming to the computer as the vehicle computer is reset. However, if a 9 volt battery saver was put into a cigarette lighter and the car battery was removed, then the computer will not lose its memory and be just fine. If you need further assistance with your battery, then seek out a professional, such as one from Your Mechanic, to help you.

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My car will not start Intermittently. I purchased a new battery 2 weeks ago and yesterday the car wouldn’t start. Got a jump and
ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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Hooked up battery cables to wrong car when jumping it
ANSWER : You may have damaged the car you were jumping from. I have seen alternator, ECM, various relays, and fuses damaged from improper jumping. You should monitor the problem to see if it continues to get worse. If so, have a local expert inspect the clicking noise and pinpoint any appropriate repairs that should be made.

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I have changed battery. I think I put non compatible battery initially and it’s start car alarm loud not turned off with remote ac
ANSWER : As long as the nominal voltage of the battery is 12 volts, it’s compatible. Of course, you need sufficient energy storage capacity, too, which in your case is probably around 850 cold cranking amps. As long as you did not reverse the positive and negative terminals (reverse polarity) when you installed the first battery, the battery is not incompatible. When new batteries are installed, inasmuch as any computer settings are lost, there can appear to be electrical problems, but such are not a fault of the battery. If, for example, you are having problems with the engine immobilizer system (security system) you may see a security warning light on the dash. If the warning light is on, to temporarily override the immobilizer system, see these instructions.

If you are experiencing electrical problems with other components, please simply request an electrical system diagnostic and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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in my car battery warning light appearing while I have replaced both battery and alternater still light is on
ANSWER : As you may yourself have seen, there are many reports of this fault with the Civic, that is a battery or alternator is replaced only to have the warning light fail to extinguish despite checking every conceivable electrical possibility. Your only recourse is to have a certified mechanic go through that exercise with your car and that involves first attempting to "re-set" the light. If the warning light returns, the alternator output has to be carefully measured both loaded and unloaded. All terminal connections have to be verified including all grounds. Fuses have to be checked for integrity (continuity) and the possibility of shorts, in for example dash wiring, has to be checked. To request this repair, simply request an electrical components diagnostic and the responding certified mechanic will seek a resolution to this.

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I locked my keys in my car and the car battery is dead
ANSWER : Hello there, thank you for asking about your 2009 Chevrolet Cobalt. You will need to have a locksmith or call AAA (if you have it) and explain the situation. The locksmith will unlock the car so you can get the keys. You will then need to jumpstart your car.

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Dead battery jump-started, but no causes found. 2014 Buick Verano
ANSWER : Hey there, thanks for writing in about your 2014 Buick Verano. This could potentially be a charging system problem. As you may already know, your car has an onboard charging system called an alternator which works to keep your battery charged at all times. If this is not working properly, your battery will not stay charged. The fact that your battery took a new charge and stayed charged suggests that the battery is not the problem. If the problem comes back and persists, have an expert mechanic, like one from YourMechanic, inspect your charging system to pinpoint any faults.

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