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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5answers
674 views

Why did a failed jumpstart work?

Sorry if this question is long, I am trying to include all the details in case that helps. My 2008 Honda Civic would not start after I had changed the brakes (left the trunk open and a door cracked so ...
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3answers
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Hybrid battery not charging fully

I have Toyota Estima 2.4 petrol/electric hybrid 2010 (UK 60 reg) that I bought about 4 months ago. So far I had no problems with anything until a couple of days ago the HV battery stopped charging ...
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How many amps should my aux battery be charging at

I’m going to be installing a 2nd battery for all my lights and stuff, I want to be sure I’m not overvolting my battery. How many amps should my aux battery be charging at.
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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 ...
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3answers
737 views

Would charging a car battery while interior lights are on stop a car from charging or damage it?

Could charging a fairly modern car with lights on (or any other electronics on) damage it? My car battery drained to a voltage of 5.5V (very low I know) because I left the interior light on for 2 days....
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1answer
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Battery status indicator confusion?

I got 45 ah battery in my car full charged 12.6v and has GREEN colour on the too indicator. It was left unused recently for 2 days, and next day, I checked the battery which gives 12.4v, however, the ...
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2answers
41 views

Trying to find an answer for my 92 Dakota not turning over

I've changed the neutral safety switch and checked the wiring from the battery to the starter and the it still nothing but i can start it off the solenoid and it runs like a charm any suggestions
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3answers
50 views

If a jump start didn’t work, will a booster work?

Car has been idle for several weeks and came to find it wasn’t starting up. Battery is 1.5 years old and first time it’s died on me. Tried to jump start it by commecting leads for some 15 minutes but ...
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2answers
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Can you attach multimeter to battery terminals while car running/charging?

I cannot remember how but recently I blew the fuse on my multimeter. All I remember was the car was running when it happened. Can I attach the multimeter to battery terminals to check voltage while it ...
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Is it harmful for my car to be only driven once a week? [duplicate]

I spend most of the time at home and I rarely drive my car. I only drive it one day per week to keep it as lubricated as possible. Is it harmful for my car? Should I drive it more often to keep its ...
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1answer
224 views

charge SLA battery while using it

I will add a small auxilary battery (lead acid 12V 2.4Ah) on my car for me head unit to be able to crank the engine and not turning off the system. Now, if I crank the engine while the unit is on, it ...
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1answer
115 views

2009 Suzuki LS650 Battery Problem/Question

I bought a new battery that had the same amp and voltage as my current battery that I was going to replace. I double checked via the website, and they confirmed it would fit my motorcycle. (Moto ...
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1answer
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My battery is saying fully charged but will still take charge does that mean my battery is going bad

Have tested battery an it reads fully charged but when I put a battery charger on it it still takes a charge . What could be wrong
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Car battery is flat, how can I tell the cause from multimeter results?

my car battery is flat. I did some measures with a multimeter. I will explain them below. Can anyone please tell me what can be the issue? Note: My car is a VW Polo 9N3 2007 Symptom For the last 2 ...
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154 views

Battery voltage drops from 12.3V to 11.2V in 5mins

I was in my car, while snowing, with the radio and the heating turned on but the engine off. I checked the battery's voltage, which dropped from 12.3V to 11.2V in 5mins. Is this behavior normal, or ...
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1answer
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battery light comes on mazda tribute

2001 Mazda tribute v6 with a NEW alternator. Will start from beginning to be clear. Original alternator went out 3 years ago. Was replaced with after market, this worked for 3 years, was replace ...
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2answers
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Battery Disconnect Switch: Shank Diameter

https://www.harborfreight.com/battery-disconnect-switch-97853.html The shank-end (in red-circle) is designed to be connected to an existing negative lead. Attempts install the device on an Integra ...
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What is wrong when the car dies after you take off the jumper cables on a 2010 Kia Optima?

What is wrong when the car dies after you take off the jumper cables on a 2010 Kia Optima?
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2answers
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Honda 2002 Accord re-set after battery disconnect nightmare

I want to get my radio/car alarm re-set and I now have figured out my special code, but am I permanently locked out? The farthest step that I get is to see the serial number (U XXXX and L xxxx, ), ...
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1answer
252 views

Battery Draw while car is off at 3.24

I have a 2007 Saab 95 wagon... For about 6 months at random about once a month my car has been dead. After calling AAA and they told me there is a draw from the battery at apx 3.24 which is should be ...
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1answer
86 views

Building E-Bike Help

I am building an e-bike using an electric skill-saw, a car alternator, and a 20Ah battery. I have a few questions because I am new to this stuff. Should I have the motor in between the wheel and the ...
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1answer
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Vauxhall Corsa won't start, lights/radio working fine

I have a 1.2L Petrol 2008 Corsa that won't start. For the last couple of months the battery light would start flashing once every couple of weeks when starting the engine. I don't do long trips often,...
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1answer
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Help needed with electrical setup for overlanding

I am converting my 2011 Nissan Frontier Pro-4x to an overland-ready setup. For this, I want to set up a separate electrical system to power certain items. I need some help calculating the requirements ...
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1answer
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Pontiac Grand Prix won't start, horn would honk, electrical system goes crazy

Some facts: My dad has an aftermarket Remote Keyless Entry Not aware of any aftermarket theft system, does not use keyless start He's used 410 watt power inverters through the cigarette lighter but ...
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2answers
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My 2010 Hyundai Elantra won't start without a jump

My car won't start without a jump. I’d jump it with cables, it will start with no problem, but as soon as I turn it off, I won't turn over.
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1answer
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If you connect 2 car batteries in parallel and one has a low charge, how much would the low charged one draw from the other battery?

I'm just wondering this for the sake of understanding. If you have a low charged battery that is connected in parallel with another battery (that is fully charged), how many amps would the low charged ...
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Car won't start if the battery has been on for ~5 minutes

I have a 2006 Honda Accord, and my car battery is not too old (1-2 years). The car starts fine, I don't normally have issues with it. However if I turn off my engine and sit in my car with the battery ...
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1answer
84 views

If driving doesn’t recharge a battery is there any point putting it on a charger?

Using a charger I managed to bring battery up to 12.18 volts or so. The car is starting up now and running however I notice on starting the battery falls below 10 volts(8.x or 9.x volts) and then ...
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1answer
69 views

Neighbor leaves his positive terminal disconnected - dangerous? [duplicate]

A guy who owns a neighboring car in the communal parking garage I park in disconnects the positive side of the battery when leaving his car for a few days at a time. Is this dangerous? If so, under ...
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2answers
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ECT registering low at steady state. (low enough to set a code) No explanation

A little back story, this is a 2015 Jeep Wrangler. Since 2017 I've kept an eye on coolant levels because sometimes I can smell burning coolant when I'm in front of the vehicle (not in the vehicle). ...
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Can somebody please tell me, my new battery's date of manufacture, please? [duplicate]

C211A 077 this is the code on my recently purchased battery....can somebody tell me its date of manufacture, please? EDIT: Forgot to add, it's a Exide Excell 80ah..sorry.
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Is it safe to disable the stop/start system?

I want to permanently disable the stop/start feature on my Skoda Octavia Mk3 (based on VW). TL:DR; The implementation is faulty. Suppose I want to pass a parked car, and slow down for a car coming the ...
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1answer
508 views

2008 Toyota Corolla doesn't start when key moved forward to “start” position

When I went to leave work tonight, the car wouldn't start. I've tried two known good keys, and cleaning the battery posts and cables where they connect to the posts. There has been no indication the ...
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2answers
91 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 ...
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1answer
52 views

Not Replacing Car Starter

I have a problem with my car starter. I believe this was a problem on my car starter since I have a mechanic who went to my office and have it check. He says the battery is ok. When I start the car, ...
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1answer
59 views

AGM Battery - Residual Voltage?

Wife's 2018 Mercedes GLA250. Car is 3 Years and 4 months old. Just turned over 12k miles. The AGM battery is at 12.25Volts after sitting unused for a week. Everything I read says an AGM battery should ...
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0answers
39 views

Battery showing lower amperage

Civic coupe vti 99. I have had my battery tested in Halfords and they said all was fine however they pointed out the amps on the battery was 263 whereas it should be 300. I have been doing not 10 ...
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0answers
39 views

Bad connections or bad battery?

Car battery had gone bad at least in part to corroded terminals. I cleaned up the terminals and eventually got battery to 12.8. it had been dropping below 10 volts on startup but with driving/...
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0answers
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DIY main battery swap on Volvo V70?

The car is a Volvo V70 2.0 D4 181 Momentum from 2014. I bought it used in 2016, but in 2017 it started having problems with the automatic start-stop thing, and a year later it started saying "...
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2answers
17k views

Disconnecting negative battery terminal

Why do almost every automotive procedure instructions start by saying: Disconnect the cable from the battery negative terminal. ?
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2answers
7k views

2005 Mercury Montego securilock appears stuck

I've got a 2005 Mercury Montego that wont turn over. You would think the thing is complete dead, lights don't turn on, power locks don't work, but the battery is full. What does happen though is a ...
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3answers
773 views

How long will battery last if disconnected at full charge during winter?

My car won't be driven during the winter, so from about November through March (5 months) it will sit idle. If I disconnect the negative terminal on the car battery when it's at full charge, should I ...
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0answers
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Peugeot 206 2003 engine overheating STOP light

I bought my 2003 Peugeot 206 second hand from a private car dealer about 4 months ago and everything seemed ok, except for the exhaust pipe appearing to be tied with plastic zip locks. About a month ...
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0answers
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Battery set up for camper

Just wondering if it's safe to run the following set up. In car - starter battery - isolator switch - second battery (lead acid deep cycle) - Anderson plug to rear of car - 2x AGM batteries in the ...
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94 head gasket replacement now my car wont start

I replaced my head gasket and once I got to putting everything back together my car wouldnt start it wont crank and I have no power going to my car and suggestions
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2answers
107 views

Why did car just overheat and aftermath?

Hyundai coupe 2006. I tried to recharge a deeply dead battery by attaching jump wires from donor car directly to terminals of isolated battery(not in car). I kept the donor car constant at 4000rpm for ...
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2answers
106 views

How to charge a 2nd car battery from the car?

I'm going on a camping road trip and need to power my CPAP. Instead of running one long cable from the car, which has its own issues, (dead battery/car, shorts, tripping) I want to get a 2nd car ...
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1answer
109 views

Car refuses to start with repeated clicking but can be jumped

Day 1: My 2013 Infiniti JX35 won't start. When I press the ignition button, the car loses all electrical power and I can hear repeated clicks under the hood. I installed a new battery, and it started ...
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1answer
77 views

How to diagnose if battery is faulty or alternator is faulty

Little Background: I own 2016 Mazda CX-5, battery that came with car was not holding the charge for long, so after some research on which battery to replace it with, I decided to replace it with ...
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1answer
91 views

Is there a way to reliably test voltage of a 12V battery when it's not disconnected (i.e., partly loaded)?

I'm having an issue where a fully charged battery doesn't necessarily report the proper voltage when checked from the socket within the car, because in order to have the socket activated, the car has ...

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