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.

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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 ...
25
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3answers
15k 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 ...
18
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6answers
38k views

Pros/cons of higher capacity car battery?

I'm shopping for a new car battery for 1998 Subaru Outback (2.5l). For the physical dimensions the battery has to match, I see some variance in capacity (Ah) rating, and in price too, of course. The ...
17
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2answers
4k 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 ...
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4answers
2k 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 ...
14
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4answers
9k 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 ...
11
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5answers
3k 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 ...
10
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4answers
24k 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 ...
9
votes
3answers
19k 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 ...
8
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2answers
2k 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 ...
8
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4answers
3k 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 ...
7
votes
4answers
34k 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. ...
6
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1answer
129 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 ...
6
votes
3answers
5k 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 ...
6
votes
2answers
99 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 ...
6
votes
2answers
334 views

How to detect a failing car alternator..?

Is there some way we can predict that the car alternator is about to fail in order to avoid a discharged battery situation on the road.. Although it will slow the sound of horn and will dim the ...
6
votes
1answer
199 views

Battery voltage slightly low. Especially when the car's been sitting for a while

My car is a 2004 Mazda 3. This happened with the last battery I had as well as this newer one. Basically if I leave the car sitting for 2-3 days without driving it, it doesn't have the voltage to ...
6
votes
2answers
85 views

Alternator vs Battery

I hadn't used my car in a week. Normally it always starts. Then one day after one week it didn't start. I got a jump from my neighbor and i was able to drive around for more than 20 minutes. I stopped ...
5
votes
3answers
1k 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 ...
5
votes
3answers
322 views

Is 10 minutes a long enough ride time to recharge a new car battery?

Would occasional 10 minute trips be long enough to charge a completely new Honda 2013 Civic's car battery, without it slowly dying over the long term? It's getting colder now and I don't drive ...
5
votes
7answers
9k views

2004 Ford Escape battery light comes on intermittently - what likely cause(s) are there?

I have a 2004 Ford Escape Limited on which the battery light has been coming on randomly for varying amounts of time while the vehicle is in active operation. I have checked the battery cables and ...
5
votes
2answers
2k views

How to put 1997 Toyota 4Runner in neutral with dead battery?

My ’97 Toyota 4Runner with automatic transmission is parked head first in a small garage with a dead battery. I need to put it into neutral to push it out on the driveway so I can jump-start it. (This ...
5
votes
2answers
225 views

Do I need to replace a battery that failed once but now seems to be testing successfully?

The winter temperatures were very low overnight in the area recently, with a low of -8°F/-22°C. When I went to start my 2007 Toyota Prius that was outside that night, it wouldn't start on its own. I ...
5
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2answers
3k 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 ...
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2answers
2k views

Can an engine stop from a bad battery?

The car is a 2005 Toyota Corolla CE. Its engine is the 1ZZ-FE, a 1.8L straight four that runs on gas, not diesel. The alternator is stock, and tests out just fine on the multimeter in both voltage ...
5
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3answers
262 views

Is there a risk of a spark igniting hydrogen when removing or installing a battery?

Guides to jumping a car with a dead battery commonly advise that the cable from the negative terminal of the good battery be connected to the chassis of the stalled car rather than to the negative ...
5
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1answer
1k views

What current is “normal” for constant battery drain (not parasitic)

I'm having some problems with battery going dead sometimes, and I noticed that there are some small sparks after disconnecting the battery for a few seconds and then reconnecting again. It is not big ...
5
votes
4answers
145 views

Is a bad battery bad for other components too?

I think my battery is on the way out - on cold mornings, it turns the engine over very slowly to start with, and takes a number of turns before the engine finally starts. This has been the case for a ...
5
votes
3answers
372 views

93 Nissan Sentra SE-R, replaced alternator voltage still low

My car died while I was driving it, but I can put the battery on a charger (or from another car, with jumper cables) and get it running albeit for a short period of time. I put a multimeter on the ...
5
votes
2answers
581 views

Dead battery — is there anything else that caused this?

My battery went dead yesterday. I couldn't hear the usual cranking sound of starter. Just a faint click when try starting the engine. Replaced the battery, then all was fine. I tested the voltage ...
5
votes
1answer
86 views

Battery won't hold a charge. 2001 Ford Mustang

2001 Ford Mustang V6. Bought brand new battery in Nov 2013. I tested the core of the alternator at the same time as buying the battery and it tested good. I also switched out a relay in the engine to ...
4
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4answers
17k views

How to diagnose a starter motor that does not work

My e46 M3 would not start when I got to the parking garage after work. When I first turned the key, I heard a sound like grinding gears, but I was so startled that I immediately stopped trying to ...
4
votes
4answers
15k views

How do I know if my car battery is dead?

By mistake, I left the headlights on overnight for my Honda Civic 2008. 24 hours later when I tried to start it, the car would not start and nothing would come on including the internal lights and the ...
4
votes
4answers
672 views

Should I turn off my headlights while having the car run to “defrost” while I scratch ice off the windows?

My 2009 Ford Mondeo Clipper has a very nice "Max Heating" setting, where it both defrosts front and back windows, and sets the airco to max temperature, max fan speed. When I find my car windows ...
4
votes
2answers
24k 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 ...
4
votes
5answers
13k 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 ...
4
votes
2answers
11k views

Where is the battery located on a Chevrolet Cobalt and how do you change it?

I'm trying to get a 2006 Cobalt back on the road. It's presenting the symptoms of run down battery (Dim lights, time on the radio is reset to 12:00, won't start). The battery is original, so it's ...
4
votes
2answers
48 views

2007 MKZ Engine Won't Turn

The engine turn has been "weak" the last week or so. This morning it was kinda cold and it wouldn't turn at all; I'd hear a slight buzzing sound and the dash lights would kind of flicker when the ...
4
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2answers
2k views

2005 Chevy Cobalt won't start, sounds like a machine gun

I haven't driven my car in about a week, and when I went to try and start it today, it would not start. It has enough battery to play the radio and whatnot, so I'm not sure if it's a battery related ...
4
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3answers
308 views

06 Ford Escape Dead Battery Keypad Entry

So, the Escape was sitting in the parking garage for a couple weeks with the keys inside and no spare available (don't ask, this is a shared company vehicle with keypad entry). The keypad isn't ...
4
votes
1answer
143 views

how to charge a dead motorcycle battery?

I have a 1983 Honda Nighthawk but the battery has died. I also have a trickle charger that you see in this photo but I'm not quite sure what amp and voltage settings I need to use for a motorcycle ...
4
votes
2answers
202 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 ...
4
votes
1answer
2k 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 ...
4
votes
2answers
1k views

What is the correct/factory wiring for a Suburban 1998 battery/alternator?

I have included a picture showing what I have now on this Suburban. Note that there is wiring not shown in the picture which is a second electrical connection to the positive side of the battery ...
4
votes
1answer
1k views

What do battery numbers mean? E.g., 26R-5N

I went to Walmart and put my car's information (2000 Dodge Neon) into the electronic battery selector, and it told me to purchase a 26R-5N battery (which matches my current battery). However, what do ...
4
votes
1answer
216 views

What's the reason for a battery light coming on and becoming brighter as the engine revs higher?

The vehicle is a 1993 LandRover Discovery 3.5 V8. Today when I hopped in to drive home the battery light came on when I started up, and remained on. It gets brighter as the engine revs and just ...
4
votes
2answers
16k views

'01 Jeep Cherokee - Check Gauges light & low battery gauge

Bought my '01 Cherokee back in March & have had nothing but problems since; I've been slowly fixing them when I have the time/cash. However, this particular issue has me stumped (and it's happened ...
4
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0answers
26 views

Alternator draining battery

My alternator has been draining my battery in my Datsun 240z since I swapped the engine (VQ35). It takes around 4 days to drain the battery to the point I can't start it. It charges it fine when the ...
3
votes
3answers
1k views

Why use a car battery charger?

What's the need for car battery chargers that I often see on display in auto parts shops? I mean a battery is sold charged (and if it discharges too much it just dies and can't be restored) and every ...
3
votes
5answers
1k views

Would leaving the headlights on for two hours permanently damage the battery?

Today I accidentally left my Hyundai i30's headlights on for two hours. When I tried to start the car the battery was very weak at first and I had no power in acceleration. Then I turned off the car ...