Questions tagged [battery-charger]

Device used to recharge a drained or dead battery.

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12
votes
2answers
3k views

Charging battery with battery charger vs jump starting and running the car

Got a 1998 Toyota Camry that has an empty battery and am wondering what the best course of action is. I have a battery charger that I am thinking of using but it's currently inconvenient to do. My ...
11
votes
8answers
4k views

Can one slightly charge a dead car battery with a portable battery jump kit?

The other week, my friend was trying to jump start a friend's very dead car battery with one of the portable power bank car jump starter kits. It looked something like the below: Image source If I ...
10
votes
5answers
9k views

Solar Charging Car Battery through Cigarette Lighter Outlet?

My vehicle's cigarette lighter outlet is limited to 10 amps output. If charging were limited to less than 10 amps, would solar panel -> charge controller -> cigarette lighter outlet work for charging ...
10
votes
1answer
322 views

Is there any advantage to keeping the battery "topped up"?

I got an engine/cabin heater installed into my car right before winter, which was great for driving comfort this winter. One of its "side-effect" features is that it charges and keeps your battery at ...
9
votes
3answers
3k views

Is charging my engine battery like this bad?

I left a 2001 V6 Honda Accord unrun for ~4 months (I don't have a license). Naturally, the battery is dead. I have heard that letting the alternator charge the battery from empty like this puts ...
9
votes
6answers
36k views

Can I charge a 12V car battery with a 16V 1.5A adapter?

Hello it's my first time here and I will try to address the issue as best as I can. I left my keys in the ignition a few days back and hence my battery drained itself. It is a 12V maintainence-free ...
9
votes
1answer
41k views

Car battery dead for a while... now it won't charge?

So, my car battery died 4 months ago while it was unused in my garage during the summer (interior dome light left on for months). I went to jump start it this morning, ran it 20km ( 30 minutes ) to ...
8
votes
9answers
53k views

2 Volts on Car Battery

My car battery has gone completely flat after leaving my car parked up for about a month. Tried turning over the car today, and none of the lights on the dash light up. Ran a multimeter across the ...
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 ...
7
votes
2answers
581 views

12V Battery change

4 weeks ago I changed a 12V battery on my Toyota Prius auto. But after being in for two weeks the battery was discharged again. I tried to recharge it, but it did not work - the charger does not start ...
7
votes
1answer
439 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 ...
6
votes
6answers
60k views

What is more cost effective: re-charging a car battery or replacing it new when it dies? [closed]

My car battery recently died and I was wondering if it is more cost effective to re-charge it or replace it with a completely brand new battery. I know car batteries are charged with the alternator ...
6
votes
6answers
97k 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 ...
6
votes
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 ...
6
votes
3answers
124 views

Multiple Batteries Charging

I have multiple batteries off from motorcycles, and each of them has it's own charge level (12-13 Volt measured at rest). Assuming I have only one 12 Volt charger, can I charge them in parallel until ...
6
votes
5answers
59k views

Car battery won't charge above 50%

I had a problem starting my car after not driving it for two weeks. After charging the battery with a CTEK trickle charger via the cigarette lighter socket, the car started fine. I had my car battery ...
5
votes
8answers
22k views

Start a dead battery car with a power/USB charger

today my car couldn't start beacuse of dead battery. The battery is not old, I simply left my dash cam attached for a few days without using the car... I'm alone at home and my car is in a difficult ...
5
votes
3answers
860 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....
5
votes
1answer
1k views

How do I keep an idle/unused battery ready for immediate use?

I have purchased an Exide Power MF Battery 120 A/H for my home inverter. I need to use that inverter only when there is no electricity. That can happen once a month or like that. So my question is, If ...
5
votes
2answers
665 views

How to prepare a car for one year of storage

This is basically the opposite question to Reviving a vehicle that has been idle for a long time I'm planning to leave my 2014 Mazda 3 in undercover storage for a year, and was wondering what steps I ...
5
votes
1answer
1k views

Drained battery; imminent explosion?

What would happens when if a car battery is drained of all its fluid and then hooked up to a 12v battery charger. It's a long story I did it to my car battery accidentally for about a minute. What ...
5
votes
3answers
5k views

battery fully discharged, got a jump-start, but what do I do now?

My battery was fully discharged (forgot to turn off headlights for a few hours). The car wouldn't even unlock from the remote. What should I do after getting a jumpstart?
4
votes
3answers
2k views

Is my car battery charger not working?

My old car battery died because I leave it parked too long. I replaced with new battery and this time hooked a solar trickle charger to it to keep it from discharging. (it's parked in public space) ...
4
votes
2answers
64 views

Battery only charges with parallel load - why? recoverable, or replace?

As a followup to Little/no charging but alternator and battery test good, the battery is only charging when the charger has a significant load in parallel with it (e.g. turning the key to the on ...
4
votes
2answers
611 views

Does a Nissan Leaf necessarily have a 6.6kW capacity on-board charger if it has Quick Charge port?

Looking at a 2015 Nissan Leaf I see it has a Quick Charge port (listed as part of the Charge Package on the spec sheet). Does this mean this car also has the 6.6kW on board charger? I'm not sure if ...
4
votes
0answers
490 views

Malfunction indicator light after a charge to low battery

My battery often needs a quick charge – 3 min or so – in the morning, then the car starts all day. Today, the light went on after the quick charge and would not go off after 2 blocks so I returned ...
3
votes
4answers
769 views

How will having two batteries effect the charging system of my 2004 Honda Civic?

I want to have a 2nd battery to power a 1000w inverter (so I do not have to start the 2004 Honda Civic). How will this affect the charging system? Will both batteries be charged?
3
votes
1answer
29 views

Does battery tender need to be in enclosed area?

I have a 2009 Winnebago Access motorhome that is rarely used. I had a battery tender but it stopped charging the battery. I purchased another tender & enclosed it in a small plastic storage box. ...
3
votes
1answer
325 views

Car battery disconnection for charging

I have read many discussions about this, but I have been unable to find a definitive answer. Many people say that it's fine to use a standard household (cheap/dumb) 12V 4A battery charger to charge a ...
3
votes
2answers
835 views

Smart charger putting out too much voltage?

Hello I bought a smart 2/4/6 amp smart charger to charge my marine and motorcycle battery. When I plug it in to charge it get up to 15.7 V is this going to wreck my batteries? I always thought ...
2
votes
3answers
2k views

Would leaving a battery booster with only one terminal connected harm it or the battery?

I have a 2003 Mitsubishi Diamante, and I keep two battery boosters in the car "just in case". My son recently bought a car that had problems starting. He has used both my boosters on his car and ...
2
votes
2answers
67k views

Can I start my car while the battery is being charged?

I'm charging a flat battery with a mains charger. I'm curious if the mains charger can also be used to jump start... If it delivers enough power? The instructions make no mention of this at all, did ...
2
votes
3answers
159 views

Radiator overflow, temperature increase, and radiator contains oily fluid

I have Dodge Charger 2007 model, ran 145000kms. Suddenly I found temperature of radiator comes high and starts overflowing radiator fluid, which is mixed with oil. Car is in running condition, but if ...
2
votes
1answer
63 views

Charging a motorcycle battery with no exposed leads

I am trying to charge this battery with this charger: However The connectors are as such: The battery is 6V, 4Ah The charger operates at 6v, 1A Without an obvious way to connect these im a bit ...
2
votes
2answers
2k views

How long should a battery take to recharge from a wall socket charger?

My battery died and I suspect the alternator. To test I need to get the car running again and so borrowed a wall socket charger. I have no idea how long I need to let the battery charge for. Would ...
2
votes
1answer
758 views

Is it possible to charge a small auxiliary battery with the alternator?

I want to charge a small 22AH AGM auxiliary battery just to turn on some light signals. I would like this battery to be charged by the alternator while the car is running. The problem is: the battery ...
2
votes
1answer
1k views

How many miles does it take to recharge a flat battery?

Our of car has sat unused for long enough the battery was totally dead. We jumped it the other day and drove around for 30min or so, but a few days later it is too flat to start again. From this ...
2
votes
4answers
3k views

12V trickle charger reads 20V with multimeter?

I have a Silverline Trickle Charger that reads 'Output 12V DC - 500mA'. https://www.amazon.co.uk/Silverline-634004-Trickle-Charger-500/dp/B001C827ZA I heard the battery bubbling after a few minutes ...
2
votes
1answer
513 views

12V AGM battery charging voltage

I have the following 12V car battery: Varta Silver Dynamic AGM 595901085 (12V/95Ah/850A), and the following car: Jaguar S-Type 2.7D. In the technical cars manual it says this: So in cold winter ...
2
votes
1answer
67 views

Electrical feed back on charger

Do chargers like the one used to charge a car battery draw power when it is still connected to the battery but not to the wall outlet? or still connected to the wall but the power is off?
1
vote
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 ...
1
vote
2answers
47 views

basics of charging a Lead Acid battery?

I want to build a poor man's portable power station. There are only two things I need to run off of it: a 240watt fan to blow up my mattress and a CPAP machine all night that is rated at 12v 3 amp. I ...
1
vote
3answers
309 views

Car battery booster/jump starter. Are they worth considering at all?

I have a Civic which I don't drive often and mostly sits in my building's underground parking. The battery has again discharged on me. While I have jumper cables and know how to use them, I have to ...
1
vote
2answers
213 views

Why battery charger has rated amp hours

I have gotten a car battery charger as a present which is rated at 6A max and is also labeled up to 65Ah max. I'm not understanding why there is a battery capacity indicated on the charger when the ...
1
vote
2answers
82 views

Is it normal for car battery to drain this fast or is something causing this?

My i10 ever since i got it years ago had battery problems. If left for 4 days after a short trip, it discharged enough to not start again without jump starting. If long trip then expect 2 weeks. Is ...
1
vote
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 ...
1
vote
1answer
53 views

How to tell what type of battery this is?

I would like to know whether it's either a lead acid wet cell, lead acid gel, or AGM battery. After reading a bit I see one method is the remove the battery and give it a shake to see if it contains ...
1
vote
1answer
243 views

Battery only charged with higher than 14.7v

My battery is 12V 8AH. 2 weeks ago tomorrow of good start engine I tried to start engine but my motorcycle was scrambling to start and I found that my battery may be damaged. Maybe it is useful to ...
1
vote
2answers
141 views

Fiat 500e 2017 charger

i just owned a Fiat 500e 2017 sport package... i wanted to make sure that the charger that come with it is the real original one and not imitative, as i saw charger with different style, how i can ...
1
vote
1answer
102 views

Can I charge a 12V 71Ah Car Battery with a 12V 12Ah - 48Ah Charger?

Can I charge a 12V 71Ah Car Battery with a 12V 12Ah - 48Ah Charger? When I try the charger says the battery is full, but the charge indicator on the battery says empty.