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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26
votes
4answers
14k 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 ...
44
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4answers
23k 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 ...
21
votes
9answers
99k 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 While they have all been replaced by warranties, it'd be nice to get the problem solved permanently.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 ...
13
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4answers
53k 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 ...
60
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6answers
8k 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 ...
26
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6answers
42k 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 ...
6
votes
3answers
74k 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 ...
5
votes
5answers
47k 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 ...
6
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3answers
79k 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, ...
3
votes
5answers
20k 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 ...
6
votes
4answers
38k 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 ...
31
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6answers
543k 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 ...
12
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4answers
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 ...
21
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4answers
6k 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 ...
8
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2answers
12k 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 ...
4
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4answers
27k 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 ...
1
vote
2answers
7k 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 ...
19
votes
6answers
29k 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 ...
14
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7answers
302k 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
58k 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 ...
9
votes
1answer
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 ...
8
votes
3answers
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 ...
6
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2answers
2k views

Is it better to hook up a Battery Maintainer for 2 months outside, or take our chances with the battery?

My wife and I are going to be out of town for 2 months, and one of our cars will be staying home and not getting much driving. We have a Black and Decker Battery Maintainer that we were considering ...
5
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3answers
8k 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, ...
4
votes
2answers
45k 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 ...
7
votes
1answer
435 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 ...
7
votes
1answer
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 ...
4
votes
0answers
178 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 ...
3
votes
3answers
7k 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, ...
1
vote
2answers
93 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 ...
1
vote
2answers
4k 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 ...
0
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0answers
47 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 ...
41
votes
3answers
110k 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 ...
10
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4answers
82k 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 ...
10
votes
2answers
155k 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 ...
6
votes
4answers
73k views

How do I know when a car battery was produced?

I have a hard time finding when my car battery was produced - can't find any defintive information. The battery is Bosch Silver with the following data printed: 5EN in huge letters and two rows of ...
34
votes
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 ...
20
votes
7answers
92k 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 ...
9
votes
8answers
140k views

How long time do I need to run the engine to charge the same amount of power that the starter took

I have a Range Rover 4.6l V8, and I'm wondering if anyone have some sort of estimate of how long time I need to keep my engine running, to charge the same amount of power that the starter took to ...
8
votes
1answer
13k 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 ...
8
votes
4answers
14k views

Will an auxiliary battery hurt a vehicle's alternator?

I am going to be road tripping and living out of my SUV for a while. I need a way to power a tiny portable cooler/fridge 24/7 and would like to be able to power my cell phone, laptop, and maybe a few ...
6
votes
6answers
96k views

Is it safe to charge two batteries off of one alternator?

Right now I have a 3000 Watt invertor wired to a 100ah sealed deep cell battery that I trickle charge at night. My plan is to run #6 wire from the battery in the engine to the spare battery so the ...
4
votes
2answers
6k views

Can hybrid cars be driven regularly without their battery?

I really like hybrid cars e.g. Toyota Prius ... but I would like to drive them without their battery so that I can drive them only on petrol and don't have to worry about battery maintenance / ...
4
votes
2answers
675 views

How long do you need to drive to recharge and offset the power it took to start?

I thought I heard the guy at the store said 7 miles, but it could have been 7 minutes. What is average? I live about 4 miles from work and it takes around 10-12 minutes to get there depending on the ...
20
votes
4answers
71k 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?
14
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4answers
53k 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 ...
10
votes
3answers
12k 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 ...
9
votes
2answers
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 &...
8
votes
1answer
10k views

Battery maintainer vs trickle charger

I understand battery maintainers, like those offered under the Battery Tender® brand, are used to keep batteries charged for long term storage, and trickle chargers are.... also used to charge ...
8
votes
3answers
41k views

Battery acid clean up

I was carrying a battery in the floorboard of the backseat area of the car. I was going to return it to be disposed in a week. In the meantime, it tipped over and a good amount of the battery acid ...