Questions tagged [battery]

A rechargeable device most often made of lead plates covered in an electrolyte and protected by a plastic shell which supplies consistent electrical energy to a motor vehicle. Often referred to as an SLI battery (starting, lighting, ignition). Powers starter motor, lights, and ignition systems of a motor vehicle.

Battery Illustration

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From wikipedia.org

An automotive battery is a type of rechargeable battery that supplies electric energy to an automobile. Usually this refers to an SLI battery (starting, lighting, ignition) to power the starter motor, the lights, and the ignition system of a vehicle’s engine.

Automotive SLI batteries are usually lead-acid type, and are made of six galvanic cells in series to provide a 12 volt system. Each cell provides 2.1 volts for a total of 12.6 volt at full charge. Heavy vehicles such as highway trucks or tractors, often equipped with diesel engines, may have two batteries in series for a 24 volt system, or may have parallel strings of batteries.

Lead-acid batteries are made up of plates of lead and separate plates of lead dioxide, which are submerged into an electrolyte solution of about 35% sulfuric acid and 65% water. This causes a chemical reaction that releases electrons, allowing them to flow through conductors to produce electricity. As the battery discharges, the acid of the electrolyte reacts with the materials of the plates, changing their surface to lead sulfate. When the battery is recharged, the chemical reaction is reversed: the lead sulfate reforms into lead dioxide and lead. With the plates restored to their original condition, the process may now be repeated.

Battery recycling of automotive batteries reduces the need for resources required for manufacture of new batteries, diverts toxic lead from landfills, and prevents risk of improper disposal.

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How to maintain a sometimes-used vehicle?

My daily commute changed from 9 miles to 9 feet when I started working remotely. That means I very rarely drive my car much. After a particularly hectic month, I didn't drive for about 4 weeks and the car's battery had died the next time I came to…
Peter K.
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Jump starting a dead battery: Connect black wire to negative pole of battery or grounded metal?

Most of the advice I've seen for jump starting cars instructs to connect the black wire to a bare piece of metal on the car with the dead battery. However, I've always just hooked up both poles to the corresponding poles on the other car's battery.…
JohnFx
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Is there a way to put Prius with dead battery into neutral?

I own a 2010 Prius. It has a dead battery, front facing forward in my garage. I do not have long enough jumper cables. I’ve searched the Internet. Did Toyota really create a car that cannot be put into neutral if the battery is dead? I need to move…
Agile Scout
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Why is my car equipped with a battery shutdown timer?

I currently live in Japan where I bought a 1997 Subaru Impreza WRX STi. Since I don't completely speak Japanese, I wasn't able to ask anybody correctly about one thing that the previous owner had installed, which is a small timer under the steering…
P1kachu
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What causes battery terminal corrosion?

I put a new battery in my car about 8 months ago. After a problem starting a couple days ago, I found that there was massive corrosion under the battery terminals, so I cleaned them out and reconnected. I've never had this problem with this car…
Brian Knoblauch
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How do I test my car battery?

My car still starts fine but when I turn off the car (just the motor . . the key is still in and "on") I noticed the headlights dim to almost off. It's and older car and the headlights don't turn off automatically. The battery is over 4 years old…
tooshel
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Is Start & Stop technology good or bad for my car? (Alfa MiTO)

I was recently in the lucky position to obtain an (almost brand new) Alfa Romeo MiTo, Progression. Like many new cars coming out these days, it has "Start & Stop" technology that turns the engine off when the car is stationary and is put in neutral…
DeVil
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Pros/cons of higher capacity car battery?

I'm shopping for a new car battery for a 1998 Subaru Outback (2.5l). For the physical dimensions, the battery has to match. But I see some variance in capacity (Ah) rating, and in price too, of course. The intuition goes, as usual, "higher is…
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How slow ( not zero) can a car engine run without hurting engine and saving on fuel

New cars have stop-start system (even though this has been available for a long time). My question is: why are car companies emphasizing shutting the engine down at a traffic light, rather than making the engine run at close to zero RPM (but…
Raj
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Why do cars die after removing jumper cables?

I work at an auction site where we have to move cars from one spot to another. Often, we get a car with a dead battery that we have to jump. I've noticed that if the jumper cables are removed a second or two after the car has started, it dies. To…
method
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Will fitting a physically bigger battery reduce the working life of the alternator?

I have fitted a much larger 12v battery to a car. I modified the clamp and battery tray to make it fit securely, it's almost twice the size of the original and has a much higher CCA rating. It works well, I left the headlights and radio on (at a low…
DizzyFool
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Replace car batteries with capacitors?

I recently watched this video on YouTube which basically shows the guy replacing a larger capacitors with some smaller capacitors which he had bought. The larger capacitors were actually in place of a worn out battery. Both capacitor packs were…
Pᴀᴜʟsᴛᴇʀ2
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Battery drains by itself when vehicle is parked (parasitic draw)

A 1998 Jeep Grand Cherokee has gone through 3 batteries in the last 3 months. While they have all been replaced by warranties, it'd be nice to get the problem solved permanently. I've tested the alternator, and it's not defective. I'm suspecting it…
PearsonArtPhoto
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Can a weak battery destroy an alternator?

I've heard a story that a weak vehicle battery can destroy an alternator or cause an alternator to fail early. Is this true, or is it largely fiction?
Amazon Dies In Darkness
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Should negative trickle charger clips be attached to the battery negative terminal, or ground?

I'm trickle-charging a car using direct connections to the battery. I thought this couldn't be simpler: ventilate, unhook the battery, connect the positive first, then the negative, then turn on the power. Then I saw this article... Locate a…
user56reinstatemonica8
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