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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2answers
7k views

What do professional battery testers actually measure?

When a garage hooks up their battery tester what does it actually measure and how does this differ from tests you might perform yourself with a volt-meter? For example, recently a garage measured my ...
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3answers
69 views

How to keep a new battery in a car from dying when I’m not driving it at all?

I haven’t driven my car almost at all in 4 months. About 2 months ago, it wouldn’t start, and it had a really old battery that needed to be replaced anyway, so I got a new one put in. Now, I stupidly ...
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3answers
1k views

AC Delco | Should this be worrying me? The battery is just 9 months old

Should this be worrying me? The battery is just 9 months old.
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3answers
99 views

Maintenance - Battery charging under abnormal low-usage conditions

Background Due to the recent coronavirus lockdown, my car hasn't been getting the mileage it's been used to. For reference, it's a 2007 Mercedes E280, with the 3.0L 6-cylinder turbo-diesel & 7-...
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0answers
54 views

Car goes silent when I turn the ignition key

I have a 1970 Chevelle. The last few times I have tried to crank the car, I had to jump it off. I charged the battery and this time when I turned the key, the dash lights came on then as I continued ...
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1answer
132 views

Connected battery the wrong way, what should I do?

I connected the battery the wrong way on an old Toyota MR2 turbo. The interior lights stopped working, otherwise the car starts and seem to work, exterior lights work. How do I repair the interior ...
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2answers
23k views

Welding on car - damage to ECU, battery, alternator?

I had to weld nuts to the outside of rounded-out allen type bolts when removing 15-year-old rear brake calipers and carriers this weekend. As I was laying under the car welding (probably running ...
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1answer
72 views

3.8l v6 Mustang 2004, randomly won't start but disconnecting and reconnecting the battery works

This problem has occurred 3 times now, so it is a running trend. Every time it occurs, it goes like this: I get in the car, insert the key, push in the clutch, and turn the key all the way to start. ...
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2answers
96 views

When jumpstarting a car from another car can one connect the chassis of one car to the chassis of the other car? [duplicate]

When jump starting a car A using a car B, can one connect the chassis of both cars together instead of connecting the negative battery terminal of car B to the chassis of car A. In theory this seems ...
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1answer
51 views

Assessing battery condition on an EV

I'm considering the purchase of a used EV (electric vehicle, with no backup internal combustion engine). From what I understand, the battery condition of an EV, and therefore its maximum range ...
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1answer
741 views

Brand new lead acid car battery reads only 12.33v. Is it faulty?

Yesterday I purchased a brand new, maintenance-free, 12 volt lead acid car battery. Specs: 47Ah and 450CCA. Before I install it in my car, I measured the voltage with a catIII digital multimeter. It ...
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2answers
164 views

Battery backup for radio

Hello all looking for some advice on a stereo I am building for my house. I have a car stereo, amplifiers and speakers, all powered by a 12 volt power supply. Everything works great, except I loose ...
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3answers
290 views

jump start car with battery disconnected [duplicate]

so this car won't start from a jump starter pack. I also tried leaving the pack in place for an hour to charge up the battery for longer before starting. I am thinking of disconnecting one cable from ...
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1answer
746 views

Battery Positive Post Meltdown

On a series of 6 inline 8 volt batteries, what causes the meltdown of the positive post on one of the batteries? Within the last two years we have had to replace 4 batteries in our golf cart. Thanks
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2answers
213 views

12v car battery isolator switch keeps blowing

I've got an Audi TT MK2 2.0 TFSI which I'm preparing for track use. I want to fit a battery isolator switch as it will be sat not being used for long periods of time plus I think it's sensible for ...
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3answers
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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 ...
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1answer
88 views

Upgrading Honda Accord Group 51 battery to a larger one

Ive a 2010 Honda Accord. The manual recommends a small group 51 battery (that's OEM as well) providing 500 CCA. Various websites say to upgrade to a Group 35 or 36 providing 650 CCA. In Chicago, ...
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0answers
65 views

Replacing Chevy Cobalt battery

I have a 2008 Chevy Cobalt, battery in the trunk. The battery was replaced with one without a hose. Do I still need to attach a hose and where?
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3answers
123 views

Portable car battery booster pack - choosing peak A vs Ah

After adventures with dead battery, jump starts, and headaches, I just replaced my car battery (it was only 6 yrs old.. :( ). I am considering a portable booster pack to keep in the car, and had a ...
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1answer
17k views

What's the lowest voltage I should accept on a brand new 12 volt AGM motorcycle battery

I recently purchased a brand new 12 volt AGM motorcycle battery. When I got it home I measured it with my volt meter and it read 11.81 volts. I took the battery back to the bike shop and tried to ...
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2answers
4k views

battery cca that is greater than what the vehicle specs require

Will long term use of a battery with cca greater than what the oem specifies damage the electrical system because of exposure to the excessive amperage?
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4answers
3k views

Minimum driving miles to keep battery charged (Honda Civic 2015)

I have a 2015 Honda Civic and I got a new battery for it about six months ago. Recently the car hasn't been starting and required jumps every morning to run. I took it to the dealership and they let ...
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2answers
651 views

I accidentally hooked the negative side of the battery up firstand the wire running to the alternator started to smoke

I accidentally hooked up negotiate cable to battery first causing the wire running to the alternator to smoke. I quickly unhooked it and hooked it up positive side first. But now my car won’t stay ...
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1answer
1k views

What are the specifications of the BXT-36R battery?

I am trying to figure out how many CCA a replacement battery for my 97 Ford Taurus should have by looking at the Motorcraft battery BXT-36R recommended in the manual. But I can't seem to find the ...
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1answer
6k views

Is it possible to charge a 12V car battery externally with another car battery?

I have a 1991 Mazda MX-5 Miata with a dead battery in the trunk/boot. The car is currently parked between two other cars facing forward, so I cannot reach the battery terminals with my jumper cables. ...
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2answers
9k views

Should I start and idle the car for some time if I don't drive it on cold weather?

So I don't drive a car very often, maybe once or twice a week. And I don't usually worry about that. When, and how often should I start the car? Should let it idle every few days if I don't drive it ...
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2answers
268 views

Can you charge a car/motorcycle battery with a portable power generator?

Can you charge a car battery with a portable power generator? Say you have a lithium, not petrol, generator, something like this or this, which you can charge in the electrical socket at home. If ...
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1answer
92 views

What Would Cause Only One Headlight to Work at any Given Time?

Say a vehicle has two working headlight bulbs. We confirm that the battery gets power to both bulbs and have seen both operating individually. What would be some reasons that only one bulb works at ...
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1answer
43 views

Is it normal for cigarette plug voltmeters to underestimate voltage?

I have two USB car plugs (you plug them into the cigarette plug and connect a USB cable to them) which also have a digital voltmeter. I noticed they both massively underestimate the voltage. Is this ...
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2answers
114 views

Car battery won't hold a charge: can one estimate how much longer it will last? Or is it best to replace it?

I have a 12V 60Ah EFB battery in a 3-year old start/stop car. The battery doesn't seem to hold a charge. Is there any way to estimate / understand how much longer it can last, or if it's best to ...
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5answers
3k views

Pep boys battery check reliable?

I am at Pep boys for a battery check. They attached some testing equipment to the battery (without disconnecting it from the car) and in two minutes minutes a print out came out and they said my ...
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6answers
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Mustang charging system warning light on, but battery and alternator both passed testing?

I have a Mustang that the battery light stays on. I changed the battery and the alternator was checked by Autozone, they said it was good. I need help
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1answer
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Why do EFB and AGM start/stop batteries need registering / programming? How does that work?

I understand that EFB and AGM car batteries, used in start/stop vehicles, need some kind of registration or programming when they are replaced. Is this always the case? Can you skip this step if you ...
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4answers
2k views

Shall I disconnect an EFB start/stop car battery before charging it?

I have a 64Ah EFB car battery in a 2018 Volkswagen car with start/stop technology. I have an Optimate 5 charger which supports EFB and AGM start/stop batteries:https://optimate1.com/om5ss/ I would ...
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2answers
4k views

EFB vs AGM batteries for a start/stop car: which is better and why? Can / should I replace EFB with AGM?

I need to replace an EFB battery in a start/stop car because it doesn't hold the charge - the battery is at 12.3V after 3 days and at 12.1V after 7. My questions are: Is it always possible to ...
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2answers
10k views

Blew the fuse for the battery

I have a 2012 Toyota 86 and I accidentally put the negative on the positive and a spark went off and I blew the fuse on the battery. Image below. Look at the little red line that's where the fuse ...
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2answers
3k 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 ...
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0answers
40 views

Renault Modus 1.4 drains battery - whirring noise suddenly begins after 10 days not moving, engine cold, all switched off

I left my car parked up (Renault Modus 1.4) and did not drive it for 10 days (in 'lockdown'). Then one evening I heard a whirring noise in the engine (after 10 days quiet, totally cold and switched ...
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4answers
10k views

My motorcycle wont start unless jumped.

I have a 2009 Hyosung 250 and I've had this problem for as long as I've had the bike and through numerous batteries. I just purchased a new battery a few days ago and it checks out good puts out 12V. ...
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0answers
160 views

2011 Ford Mustang Gt "Check Charging System" light after changing alternator

My mustang started showing a code for "camshaft position sensor" so I replaced it. 1 day later, it came back on, same sensor so I started doing research. Everything I read said it was probably the ...
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4answers
95 views

Bad battery, or something more?

I have a 2005 Ford Freestyle, I’ve been doing a lot of front end work on it and had the radio on In it one day for a substantial amount of time, maybe 6 hours. Needless to say it died and later that ...
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0answers
1k views

Alternator: amperage when charging a car battery (and time to charge)?

What is the amperage of a typical car alternator when charging the car battery, and how long would the alternator take to charge it (let's take a 60Ah battery as an example)? I have seen multiple ...
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1answer
2k views

Car battery charging: a few questions on connecting negative clips to ground (which I couldn't find anywhere)

I understand that, if charging a car battery without removing it from the car, you should attach the negative crocodile clip not to the negative of the battery but to a metal part of the car; most ...
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1answer
94 views

Ok to leave Honda Jazz without a battery installed?

We have a 2009 Honda Jazz, which we're not using at the moment due to coronavirus restrictions. We're planning on taking it for a 15-20 minute drive once a week to keep it going, as advised in this ...
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1answer
147 views

How is alternator directly connected to vehicle electronics?

I've tried a lot of research but I can't find specifically what I'm looking for no one has actually mentioned this and I've looked at various wiring diagrams which still don't prove how this is ...
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1answer
114 views

Should I worry about the battery performance when not using my Xiaomi M365 not being used for a long time?

Before SARS-CoV-2 hit the world, I use to regularly ride my electrical scooter (Xiaomi M365) for commuting. Due to the epidemic the country entered an emergency state and we are all forced to sit @ ...
2
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1answer
46 views

Diagnosing alternator or starter on a 16 Chevy Cruze LT

how do you know if it's the battery starter or alternator in a 2016 chevy cruze lt when i started the car it sounded like it wasn't going to start also not sure if it's related but i had to get a jump ...
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2answers
70 views

2014 Cruze lt won’t start. New battery, New starter?

Went to jump start car after sitting over night lights and wipers came on. Heard 5 clicks and engine wouldn’t start. After 45-60 seconds with jump car shuts off completely. After replacing the starter ...
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1answer
24k views

How can I tell if a flat car battery is charging when hooked up to a trickle charger?

I've been researching charging flat batteries and I think, if I've understood correctly: Trickle charging isn't always possible from flat, because: Some trickle chargers don't charge at all unless ...
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1answer
99 views

Charge car battery with a table top PSU

My car's battery got flat and the car doesn't start any more. I have a table top PSU rated for 0-15 V, 3.5 A max and 1.7 A continuous, and would like to use it to let the car start again. The battery ...

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