Questions tagged [battery-charger]

Device used to recharge a drained or dead battery.

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Cause of stator burn on ER-6F 2009

So yesterday I stopped for gas and when I tried starting the bike again it did not work. After some google-ing I found it was probably the stator. When I opened up the bike the stator had a burn spot. ...
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14 votes
5 answers
2k views

Factors Limiting EV Battery Acceptance Rate on DC Fast Chargers

There is a bunch of, relatively speaking, inexpensive EVs with 200-250 mile (320-400 kM) range -- e.g., the Kia Niro, Subaru Solterra, Volvo C40, and late model Nissan Leafs. All, in my experience ...
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How can I charge a depleted motorcycle battery?

I left my motorcycle too long without using it and now it won't start. The last time it happened I brought the bike to a shop, and they were like there is nothing wrong with your bike, it's just out ...
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Did I damage my car battery?

I have a Smartech battery charger charging my car battery for the last two years since I haven't been driving the car. I just realized I have been charging it wrong. The manual said for a negative ...
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Under what circumstances should you use the Fast Charge or Trickle Charge settings on a car battery charger?

When using a modern battery charger to recharge a basic car battery that is in good condition, but is run down to the level that it is unable to turn an engine over, under what circumstances should ...
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How to tell if a battery charger/tender is suitable for hardwiring?

As mentioned in a previous question, I am looking to hardwire a battery charger/tender in my car, so I can just plug it into mains voltage when the battery is drained, or the car is sitting outside in ...
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1 vote
1 answer
100 views

Safety around permanent trickle/float charger connection for car battery

I rarely use my second car, as a result, the battery often drains too much by the time I need it. I have a slow charge battery pack which works if I want to wait a while to get to the minimum level to ...
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3 answers
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ODB connection for solar panel

Could I connect to the ODB socket to trickle charge my car battery with a solar panel on my Toyota Prius 07, and how to?
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Harbor freight jump pack, broken input jack, repairable?

I received a harbor freight Cen-tech battery jump pack as a gift. It got knocked over when I took it camping to charge my phone and inflate my bed. Now the input jack (the part with the prongs) is ...
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1 answer
374 views

What causes car battery to hold only 5v?

One of my cars was parked for a few months and it couldn't start after that. I could jump start the car and gave it some good drives (2hrs in total) to recharge the battery. However, that didn't help ...
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When a car battery finishes charging how long do I have to unplug the charger before the battery is damaged?

This needs a little explanation since it only applies to a specific type of charger. My charger is a standard vintage Sears 6/2 amp charger . Back in the day the chargers did not automatically shut ...
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Swapping a split relay for a DC to DC charger

I am currently exchanging a split relay charger in my motorhome for a DC to DC charger as I am installing a new gel as the house battery and need to regulate the voltage more precisely. I have a fused ...
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12 votes
3 answers
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 ...
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3 answers
138 views

Hardwire a battery charger?

Since my car is currently parked outside in a Northern European winter climate, and only being used for short distances, the battery is sometimes just barely able to start the car, sometimes it can’t ...
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5 votes
3 answers
1k 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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Lithium car battery won't jump van's battery but regular jumper cables work

Twice over the past year my wife has left something on in our Honda Odyssey. Both times I've not been able to jump start the van using a NOCO 1000Amp 12-Volt lithium battery. But, both times I've been ...
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Do I need a battery maintainer, a portable jumpstarter, or a completely new 12V battery?

Hybrid vehicle has not been used for several months due to COVID-19 pandemic. Vehicle has a 3 year old 12V AGM battery. Battery is not used as a true "starter" battery; it just boots the ...
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Trying to Charge Honda Fit 2015, Car's Headlights Flash Once Charging Starts

I'm not a car person at all, so thanks in advance for any help! My wife's 2015 Honda Fit hasn't been used for months (thanks to Corona). I'm trying to use a Schumacher SC1307 6/12V Automatic Battery ...
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1 vote
2 answers
54 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 ...
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12 votes
8 answers
6k 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 ...
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3 votes
1 answer
34 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. ...
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Use of 12v Solar powered 2.4watt battery charge

My car is not being used on regular basis, sometimes not for weeks/months. Can I use one of those AA 12V Solar panel 2.4 watt car battery charger to keep the car battery topped up all the time. Can I ...
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2 votes
2 answers
1k 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 ...
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1 vote
2 answers
179 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 ...
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187 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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2 answers
421 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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1 vote
1 answer
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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1 vote
4 answers
3k 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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1 vote
1 answer
315 views

EFB (enhanced flooded battery) I left the lights on for more than a week because of Coronavirus

I have a Renault captur 2016 vehicle with start and stop capability, the battery is EFB 70Ah 720A, I couldn't start the engine with cables connected to another standard battery of another running ...
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1 vote
3 answers
326 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 ...
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2 answers
106 views

Charge a car battery with a solar panel that only has USB outputs

I currently have a solar panel (this one), that is able to output 24W of power at peak capacity. I would like to be able to use this solar panel to trickle charge a car battery, but the panel only ...
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2 answers
447 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 ...
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1 vote
1 answer
65 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 ...
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Is there a way for the dealership to revive a dying battery?

Long story short, 2 years ago, my wife brought her car in for normal servicing to the dealership. They told her the battery needed to be replaced. She said she didn't want them to replace the ...
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5 answers
1k views

What can cause a complete battery drain while plugged into charger?

I own an Aston Martin Vantage V8 stationed at Mallorca, which I use when on vacation. Last year, the car had a new high quality battery replacement. The car is plugged into a charger when parked in ...
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1 vote
1 answer
124 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.
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0 votes
1 answer
311 views

Why is my car battery charger not powering on?

I've had my car battery charger for about six months and, just recently, it won't power on. When I connect it to the battery and the mains, the orange light comes on but there is no low humming noise ...
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0 votes
3 answers
65 views

How can I evaluate a used automotive manual battery charger?

How can I evaluate a charger before I buy it? I don't own any kind of amp meter or electrical test devices other than a 30 year old $15 multimeter. I'm looking to buy a used, high-amperage, manual ...
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1 answer
67 views

How long should I leave a 3 amp charger on my mower battery

How long do I Charge my mower battery with 3 amp charger
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4 votes
2 answers
73 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 ...
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1 vote
1 answer
289 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 ...
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10 votes
5 answers
13k 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 ...
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1 vote
1 answer
149 views

12v starter battery True amps available why volts come back so fast by running engine 5 mintues?

The OEM start battery on my new van is 70AH, 120RC. I have a 12v freezer that consumes about 3amps @ 12v. It takes the freezer about 6 hours to freeze a gallon of water. My battery is not a deep ...
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-1 votes
1 answer
57 views

Use of diode to charge in-house battery from motorhome solar system

I want to charge in-house battery (Fiat Ducato) from the motorhome solar system. I presume I can use a diode to do this? Can you please advise and what size diode would be necessary. Thank you.
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1 vote
1 answer
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Frost on parts under hood of car

I have some questions. I recently woke up to a dead battery. It's been below zero lately so it's not surprising as it's not an every day driver. Yesterday when I opened the hood to check the battery ...
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0 answers
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2006 Corvette battery tender location

I have a 2006 Corvette (C6) that isn’t driven a whole lot and I want to hook up a better tender the most convenient way possible. Obviously I can hook it up directly to the battery terminals but I’ve ...
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4 votes
3 answers
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) ...
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  • 203
1 vote
2 answers
448 views

Boat Alternator Charging 4 Batteries 70 Amp Draw 50 Amp Charge

This is the current situation, looking for some expert advice. Total amp draws with night time running lights + GPS + other accessories I am at about 70 amps. My alternator puts out max 50 AMPS ...
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2 votes
1 answer
827 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 ...
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2 answers
813 views

My car battery keeps dying, what should I do?

Because I used to leave my car unused for extended periods of time (couple of weeks), the battery can't remain unused 3 days without dying. And using jumper cables everytime is difficult. I bought a ...
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