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.

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57
votes
6answers
7k views

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 ...
41
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3answers
19k views

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 ...
40
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3answers
75k views

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 ...
33
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1answer
6k views

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 ...
27
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6answers
430k views

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 ...
26
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6answers
41k views

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 ...
25
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6answers
131k views

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....
23
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4answers
12k views

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 ...
23
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4answers
54k views

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 ...
21
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7answers
7k views

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 ...
21
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9answers
91k views

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 ...
21
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4answers
5k views

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 ...
20
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4answers
50k views

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?
20
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8answers
31k views

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 ...
19
votes
6answers
25k views

Adding a additional battery to car

I have purchased a brand new Toyota Innova. I need to install a a mac mini, 2 laptops and make this car a mobile office. I need to know if I can install another car battery in parallel, and will ...
17
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3answers
4k views

Why is gas around a car battery only at risk of ignition from jumper cables?

As pointed out in Jump starting a dead battery: Connect black wire to negative pole of battery or grounded metal?, you connect the black jumper cable to the dead car's chassis to avoid sparks made ...
17
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6answers
66k views

Can I jumpstart a non-hybrid car from a hybrid or full electric car?

This morning I had starter battery troubles with my 2001 VW Eurovan. As it happened, my father-in-law arrived just at the right time in his fancy new Toyota Camry hybrid. So we opened the hoods, dug ...
16
votes
7answers
60k views

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 ...
15
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5answers
260k views

Is it possible to harm your car by giving someone a boost?

This post explains why it's a potential hazard to clip to the negative post on the dead battery when giving a boost. But I've also been told that I could damage the electronics in my own car if I give ...
14
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6answers
19k views

Can I jump start one car with two other cars in parallel?

If I'm in a pinch, and I have a small car that can't put out enough cranking amps to start a bigger one, could I connect two cars in parallel to start the bigger one? Will it mess up the alternators ...
14
votes
2answers
4k views

Why put copper in between battery contacts and clamps?

We have bought a used Toyota Yaris. Yesterday I allowed my kids to play in the car, and they discharged the battery... So I went to take it out to charge it up and I found pieces of a copper and ...
14
votes
3answers
4k views

Can a lithium-ion battery really start a truck?

There are some compact lithium-ion powered devices on the market that claim that they can start cars and trucks. Youtube is full of videos with reviews and people actually starting cars with them. And ...
13
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7answers
35k views

Battery removal or just disconnect neg. terminal

I will be away from winter through early spring, approximately 4 months. My 2014 Sierra truck will be in my garage. Should I remove the battery completely or just disconnect and tape up the negative ...
13
votes
4answers
2k views

what is the process for replacing 12V car battery?

What is the process for replacing the 12V battery? How would I clean the contacts of the terminals? My OEM battery in 2008 Jetta SE 2.5L appears rather clean, including the terminals, but I recall ...
13
votes
5answers
207k views

How do I determine what type of jumper cable I should carry?

I recently bought a used car, and it didn't come with any jumper cables, so I'm going to buy some. I briefly looked around at a store and online, and there seems to be a wide variety of prices and ...
13
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4answers
34k views

How do I apply dielectric grease to my battery?

I recently had a new battery installed in my 2006 Subaru Forester. The shop did not use any dielectric grease, just connected the leads to the terminal and that's it. What is the preferred method of ...
13
votes
2answers
3k views

What can we reliably tell from an in-vehicle battery voltage display?

The Red Cross division I am with recently purchased a new ambulance. It comes with a touchscreen display in the cockpit where we can control lights, sirens, check the temperature in the back, control ...
13
votes
4answers
83k views

Using a car with an inaccessible negative battery terminal to jump start

When trying to jump start my Volvo XC-60, I came across a very unexpected problem. I tried to use our 2nd vehicle, a 2010 Ford Escape, as the assisting car to jump start mine. But when I looked at ...
12
votes
7answers
26k views

Can a car AC unit be run on just the car battery?

This might be a silly question but I was wondering if a car AC unit be run off entirely on battery or alternator? As this could help in Preventing power loss during important times such as ...
12
votes
3answers
33k views

Why should I connect the red/positive terminal first when jump starting?

So, it's fairly popular consensus online that it's red/positive clips to the positive/red posts, then the black/negative clip to the frame One site mentions sparks, but you'll still get a spark when ...
12
votes
2answers
17k views

How do you remove or even get to the car battery on a 2012 Honda Odyssey?

Summary How do you get to the battery on a 2012 Honda Odyssey, given that it is blocked by some type of intake tube**? **Edit: this used to say exhaust but I changed it to intake tube, given the ...
12
votes
2answers
17k views

Why might I experience a power falloff after starting my car with the AC On?

I have a 2000 Chrysler Neon which generally runs well. I have noticed that if I start the vehicle, turn the AC on and reverse out of the driveway, the engine seems to struggle/sounds like it is going ...
12
votes
2answers
22k views

Non-functional gas pedal, engine stalling, dead battery: broken alternator?

I have a 2005 Nissan Sentra. The following happened twice within a few days: I stopped at a red light. When the light turned green, pressing the gas pedal had no effect at all. However, the car would ...
11
votes
3answers
45k views

Is 15V too high for a standard car battery?

Today I let my car battery charger charge a car battery over about 8 hours and probed the voltage to be about 15V with still 2 amps being pumped through by the charger (though the current was slowly ...
11
votes
3answers
19k views

When should I disconnect the battery to stay safe during repairs?

I am planning to do some car fixes and want to know what precautions I must follow in order to make it safely. Specifically, I'd like to know is for what kind of work, the battery should be unplugged. ...
11
votes
3answers
7k views

How to upgrade a motorcycle battery to a bigger AH battery?

My motorcycle (honda CBF150) came with a 12V 3AH battery. I want to change the stock 35w headlight to a higher power one and connect them directly to the battery (the stock ones are not, and they ...
11
votes
7answers
195k views

How many amps should my car pull while it is turned off?

I've recently started having a bit of trouble with my car. I typically drive my car to and from work each day. A couple weeks ago I went on vacation and when I returned, my car battery was as dead ...
11
votes
4answers
180k views

What could cause my Honda Civic to not start? And how can I address the issue?

I need help trouble shooting my honda civic. It will not start. I was driving it earlier today and I went to drive it again when it would not start. I'm glad I was at home when it decided to quit. ...
11
votes
7answers
218k views

RPM and duration to recharge a battery?

My car had been sitting for a while without being driven. The battery now has a weak charge but it can get the engine started (barely). I would like to charge the battery by running the engine, but ...
11
votes
4answers
25k views

How to assess battery charge level and alternator performance?

What diagnostics can be done to to assess battery charge level? I'm interested both in one-off tests like can be done in car service and also continuous monitoring during normal use. Car panels ...
11
votes
3answers
33k views

how fast does the alternator charge the battery?

It would appear that the common word of wisdom is that car alternators provide 50A of output. I actually looked at the supposed specs for my 2008 Jetta 2.5L on the internet -- a compact car -- and it ...
11
votes
4answers
31k views

Remote Key Fob working only inside the car (close to receiver)

I am struggling to get my Peugeot 308 2-Button Remote Key back to work. I noticed first issues when my Remote Key unlocked / locked the car after several attempts. Then one day it suddenly did not ...
10
votes
3answers
7k views

I charged my car battery with no water in it

I have a car battery that I am trying to recharge. It measures 3.28v, and my charger is a Selmar Turbo 8. This is the charger I am using: Here is a picture of the ammeter gauge that I found First ...
10
votes
5answers
44k views

How can a fuse drain a car battery?

My car battery drained itself after a week of not being used. I was researching how to identify the cause, and saw a comment under this article saying: What if I am not detecting a reading but the ...
10
votes
2answers
76k views

Lots of sparks and heat when jump starting a car

I just tried to jump start a friend's car. When I connected the jumper cables, there were a lot of sparks. They were connected for nearly 30 seconds and I noticed a lot of heat and smoke coming from ...
10
votes
3answers
1k views

Why do attempts to charge a flat car battery with an electronic battery pack give results as if there's a short circuit?

I'm not having a good weekend - car wouldn't start, even when jump started using a conveniently placed 12v generator battery (almost identical to this question, I suspect dodgy cabling to the starter)....
10
votes
3answers
7k views

Car Battery Dying Overnight - Disconnected

I have been having trouble starting my car (needed to jump it twice, once in the morning, and once in the afternoon). Sometimes it would make a clicking noise when trying to start or it would be ...
10
votes
1answer
149 views

Is there any advantage to keeping the battery “topped up”?

I got an engine/cabin heater installed into my car right before winter, which was great for driving comfort this winter. One of its "side-effect" features is that it charges and keeps your battery at ...
10
votes
2answers
224 views

Unknown part fell out of my motorcycle

So I was taking the battery out of my bike (99 Honda Shadow 750 ACE) to ship it this past December, when two parts of the bike I'd never seen fell out from somewhere near the battery case. They sort ...
10
votes
3answers
2k views

Toyota Prius Mk2 “gasoline only” operation mode

I want to get a used Toyota Prius Mk2 (XW20). I do not necessarily need to operate it in hybrid mode (gas + electric) and I am OK with operating it in a kind of "gasoline only" mode (because of a ...