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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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28 votes
4 answers
19k 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 ...
tooshel's user avatar
  • 1,051
46 votes
4 answers
28k 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 ...
JohnFx's user avatar
  • 768
21 votes
9 answers
104k 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 While they have all been replaced by warranties, it'd be nice to get the problem solved permanently.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 ...
PearsonArtPhoto's user avatar
14 votes
4 answers
80k 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 ...
QueueHammer's user avatar
26 votes
6 answers
43k 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 ...
DeVil's user avatar
  • 523
6 votes
3 answers
85k views

Interpreting AC Delco's manufacturing date for car batteries

I understand that AC Delco encodes the month of manufacturing a car battery using two digits and encodes the year by one digit. The battery I just purchased, for example, is labeled P124R, which, ...
Calaf's user avatar
  • 1,555
6 votes
5 answers
90k views

What happens if I disconnect the battery while the car is running?

There are some comments on the question Are there any modern diesel engines that require electricity to continue running? suggesting that disconnecting the battery while the car is running can damage ...
James Jenkins's user avatar
3 votes
5 answers
21k views

how much water can be safely added to a battery?

My 2008 Jetta SE 2.5L has the battery as follows: ENERTEC EMC // 1J0 915 105 AD // 12V 61 Ah 330A DIN // 540A EN/SAE. It would appear that the battery can no longer hold the starting charge after an ...
cnst's user avatar
  • 1,515
1 vote
2 answers
8k views

AC Delco production date

Recently I bought AC Delco batteries for my corolla 2006 car. The sealed number is(P7967). I tried to understand it but I couldn't because most of the posted answers where for sealed with only three ...
Love Eva's user avatar
6 votes
4 answers
53k views

Technique to test an alternator - fact or fiction?

A friend explained that the following is a simple way to test an alternator to see if it is working: Turn on the vehicle. While it is running, carefully remove one of the 12V battery leads. See if ...
End Antisemitic Hate's user avatar
62 votes
6 answers
10k 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 ...
Peter K.'s user avatar
  • 1,009
32 votes
6 answers
562k 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 ...
Brian Knoblauch's user avatar
22 votes
4 answers
7k 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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
13 votes
4 answers
26k 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 ...
Pēteris Caune's user avatar
8 votes
2 answers
13k views

Battery Light Won't Go Off Since Changing Battery

I just changed the battery on my 98 Mazda 626 and now the battery light comes on and stays on after starting the car. I checked the battery and it's reading 12.8v with the engine off, and 13.8 with ...
Robert S. Barnes's user avatar
6 votes
3 answers
101k views

Getting information from manufacturing code on Exide car battery

If you can help me decode the following manufacturing code on EXIDE EA640 battery, especially which production plant has made it what was the date of manufacturing Code: 3EC28K5 Perhaps 28K means ...
miroxlav's user avatar
  • 495
4 votes
4 answers
28k views

Should I use coca cola or baking soda + water to clean my battery clamps?

The clamps that are attached to the car battery are corroded, I was told either of these liquids will work. Which one is better? Is there a how to guide on the exact steps I need to take? With my ...
ironcyclone's user avatar
44 votes
3 answers
145k 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 ...
Agile Scout's user avatar
19 votes
6 answers
32k 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 ...
Siddharth's user avatar
  • 293
14 votes
7 answers
323k 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 ...
logicalscope's user avatar
11 votes
4 answers
77k 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 ...
cnst's user avatar
  • 1,515
9 votes
1 answer
4k views

Why the different the colors of terminal corrosion on the battery?

I have a 2001 Ford Windstar. When I went to clean the battery terminals: the one with the RED cover over it was a bright blue color; the other had normal white corrosion. I do not know why the this ...
Sharon Maxon's user avatar
8 votes
3 answers
6k views

How should I prevent my battery going flat when I leave my car alone for a month?

I will be leaving my Focus alone for around a month in (scottish) winter weather. Ordinarily I would make sure to take the vehicle out at least once a week to prevent the battery going flat in the ...
kdt's user avatar
  • 181
7 votes
1 answer
549 views

how do i know if my lead-acid battery has been resurrected?

The OEM battery in my 2008 Jetta SE 2.5L has been nearly fully discharged one month back (had insufficient surface charge after a prolonged use without the engine running, but leaving it idle for 20 ...
cnst's user avatar
  • 1,515
7 votes
1 answer
1k views

Intermittent starting trouble with new battery

I sometimes have problems starting my 2003 Ford Fiesta Diesel. When I turn the key it'll either start normally or just start to kick over then die. If I try again, the same thing happens. My battery ...
MBell33's user avatar
  • 73
5 votes
3 answers
12k views

Clicking sound when trying to start

We haven't driven this car much in the last month, so it's been sitting in our back yard. Yesterday we tried to start it up, but it is making a clicking sound while turning the key in the ignition, ...
Michael Morris's user avatar
4 votes
0 answers
216 views

Negative surface charge?

At about 20°C, there has been a situation that the OEM battery in my '08 Jetta was not capable of starting the car at all (virtually no movement of the starter at all), after being used for at ...
cnst's user avatar
  • 1,515
4 votes
2 answers
47k views

What is the difference between a normal battery and a maintenance free battery in a 2 wheeler segment

What is the difference between a normal battery and maintenance free battery. Is a maintenance free battery really free of maintenance or just it requires less no of charge cycles. I currently own a ...
user285oo6's user avatar
3 votes
3 answers
8k views

why does the VW dealers in NA have a different battery than OEM?

My 2008 Jetta 2.5L SE came with the following OEM battery in North Carolina: e ENERTEC EMC 1J0 915 105 AD 12V 61 Ah 330A DIN 540A EN/SAE (Note that some appear to come with VARTA as the OEM vendor, ...
cnst's user avatar
  • 1,515
1 vote
2 answers
5k views

Faulty Motorcycle Regulator?

I am on my second 12v motorcycle battery in a couple of weeks. Will a faulty regulator, ie too higher volts, cause this? Also I have upgraded my ct110 to a 160cc, all works well for a few days, then ...
Myles Aloysius's user avatar
1 vote
2 answers
319 views

Parked car causing fire

Scenario: There is a parked car in a garage, that's been unused for a month and has the negative side of the battery disconnected. Car is from 2001. Could the battery explode? Or could the car cause a ...
Noobie1357's user avatar
0 votes
0 answers
69 views

Why did car go quiter and cut out after fuel change?

I did a fuel change and during it was concerned that I may have put diesel in my petrol car because it wasn't clear which pipe was which. However the handle was green and said unleaded so I guess it ...
James Wilson's user avatar
  • 2,736
34 votes
1 answer
7k 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 ...
P1kachu's user avatar
  • 457
21 votes
4 answers
90k 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?
End Antisemitic Hate's user avatar
21 votes
7 answers
133k 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 ...
user56reinstatemonica8's user avatar
20 votes
6 answers
128k 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 ...
Digital Trauma's user avatar
16 votes
5 answers
376k 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 ...
Gregory Bell's user avatar
15 votes
5 answers
69k 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 ...
Pangea's user avatar
  • 418
14 votes
2 answers
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 ...
Matas Vaitkevicius's user avatar
13 votes
2 answers
23k 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 ...
gMale's user avatar
  • 233
11 votes
7 answers
303k 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 ...
RLH's user avatar
  • 213
11 votes
3 answers
10k views

Do battery corrosion pads really work?

I see various sources suggesting that chemically-treated felt pads be placed under battery terminals, to reduce or eliminate corrosion - like these: Usually either red/black or red/green. Do these ...
culix's user avatar
  • 301
11 votes
3 answers
46k 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. ...
Eugene S's user avatar
  • 479
11 votes
2 answers
2k views

Should I get a battery tender for a car not used for long periods of time?

Could anyone please help me? I have a Honda Civic 170i car in South Africa which I keep in storage for long periods of time while I'm working in the UK. I'm going back to SA in August for 2 months &...
Bev's user avatar
  • 111
10 votes
2 answers
164k views

Car Battery won't charge after sitting for a Year

I have a main starter battery and a leisure batter in my van. They have been left unused for around a year with my van off the road. I am now trying to get it up and running however I am unable to ...
Kit's user avatar
  • 203
10 votes
3 answers
15k 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 ...
easycheese's user avatar
10 votes
2 answers
1k views

Are there downsides to making an accessory socket always live, if accessories are removed when not in use?

In some cars, the power line from the battery to the accessory outlet (aka cigarette lighter socket) is always live. In others, it's off until ignition. It seems pretty much random which cars are ...
user56reinstatemonica8's user avatar
10 votes
4 answers
94k views

What precautions are needed when charging a car battery in an apartment?

Suppose a car owner lives in an apartment building and parks his car nearby. He wants to detach the battery, bring it home and charge it with a mains-powered charger indoors. How to properly handle ...
sharptooth's user avatar
  • 1,376
9 votes
2 answers
20k views

How can I tell if a car battery that went completely flat is permanently damaged?

I've had a lot of electrical problems with my car, and a couple of times, the car battery voltage got drained absurdly low (like below 2V) for short periods of time. I gather that fast charging ...
user56reinstatemonica8's user avatar
9 votes
1 answer
15k views

How to track down an intermittent battery drain?

I know there are several questions on here about finding the source of a battery drain (like Battery drains by itself when vehicle is parked (parasitic draw) ). However I don't think the answers ...
brooks94's user avatar
  • 193