So, Really, How Long Does It Take To Charge A Car Battery?

It can often be a frustrating process to get a grip on car vehicles and their specific charging patterns with safety as a priority. This is most especially the case when you need a ride or want to get the job done in the most effective and efficient way possible on the occasion that you need it for. If you have ever had the experience of having been reeled in or pushed through by people because your battery could not start properly, then you all know what is being talked about here.

And, even worse, ever had a dead car battery and really did not know how you need to go about things when it comes to jumpstarting the engine? Well, in this article, you will be guided and accounted for when it comes to car charging and car batteries and most specifically, on questions regarding how long does it takes to charge a car battery—real important for a lot of people.

Let us just go and hit you with some truth points right here: how long it takes for a car charger to charge a car battery varies depending on whether the car has a dead battery, voltage range adjustments and essentially, temperature sensitive fluctuations that may occur based on the type of materials these car batteries are made of.

But a rough estimate is around 12 hours. Wow, quite a whoosh of information right? Well, yes, it is a boatload of stuff running through that answer but it is an appropriate answer with regards on how long to charge a given car battery. Given that answer, you really just have to take heed of each factor and you can get your own estimate as to how you personalize and customize your charging times appropriate and justified for you.

But, if you are interested in getting a deep dive into the details (the devil is in the details, as they say), then be sure to scroll down further as this article can give you a breakdown as to how this all shakes out to give you a perspective on this question.

Real Talk Question No.1; Is Your Car Battery Actually Dead?

First off, when it comes to charging your dear car batteries, please do secure and gather information on whether the car battery is dead. The state of “dead” is different from being undercharged or overcharged. Dead car batteries are batteries that will not push through their engine process until you jumpstart.

Okay, so what is a “jump start?”. It is a term often used when indicating a process by which you give enough of a “charge” to a given dead battery strong (and safe enough) in order to get the battery cells (that are dead) in motion, again.

All right, all right, genius. How does one jumpstart the car battery so I can move on to knowing the length or duration of charging my car batteries?

Well, for a proper jumpstart to work, you most likely need these things that are mentioned below:

1. Your dead car battery (and your car)
2. A spare car (say your friend’s) with a charged car battery
3. A set of cables to attach to terminals

Oh, and you might want to do this process in a well-ventilated place (in the case of gas leaks) and having the two cars near each other (hey, those cables can only go so far, you know what I mean?).

That said, you can now attach the cables in their respective positive (+) and negative (-) terminals, starting with the positive first (to the charged car battery and then to the dead car battery) and negative last (same as with the positive terminal setup).

After charging, you remove them in the order that is reversed to the order you put them in. Make sure to turn off appliances connected to the cars while doing this. The “jumpstart” should take about two minutes for the charged car to transfer a charge and then another two or three minutes for the dead car battery to receive it.

Take as many (safe) repeats as needed to get the process done and have someone supervise and monitor, if at all possible.

Real Talk Question 2: Do Amperes and Voltage Range Determines How Long To Charge?

So, the first question really dealt with the car battery. This question, however, deals much more on the aspects attributed to the charger of the car as opposed to the former. And the determination of how a charger can help in lengthening or shortening the charging process is an important consideration to make with regards to the overall duration of how long a “charge process” in a car can be made in summary.

This said, what are some aspects to a charger that we can look at to help us understand how they affect the overall charging rate.

Firstly, though this aspect is about chargers, we must take note that cars usually have a voltage system of about 12 volts. And they are usually like that when it comes to standardization. That means, if you have a charger that has, say, a 40-ampere distribution, you can charge a battery charge level but a slow and steady charger of about 2-ampere distribution is potentially safer in terms of keeping a car battery at a sustainable level (safer and less dangerous).

Okay, let us take into account some sample observations between amps and charging rates to car batteries:

At 40 amps…

You will get (as stated above) a quick and overall more efficient charge. This kind of charging rate will transfer over to more convenient jumpstarts, especially when in the midst of traveling.

Problems can occur, of course, when you have the risk of overcharging when it comes to rates like these. These can damage the battery overtime when not monitored properly. Cases of overcharging are common enough and most experts add in the recommendation of now only getting chargers at the 40-ampere range but also that it be a “smart” charger.

This indicates that the charger has a more advanced and integrated microchip system to become automatic enough to understand when a “fully charged” state is achieved (even without you monitoring).

At 2 amps…

Well, compared to a higher rate off charging, “slow and steady” is often an appropriate level of description when it comes to this. This can take then than a very, very reasonably long time for your car battery to charge (as much as 24 hours, bro!) to reach an acceptable state.

Often, this is not only associated with “slow and steady” but also termed as a “trickle” type charger. If we could joke about it, we can also refer to it as a “tickle” charger (right, that was bad, sorry).

Moving on, this is obviously not so much a good choice for someone traveling and going on to the location to location. This is more for a reservation based charge and at a conservative rate (to boot!).

Again, car battery experts like Mark Neal from BatteryManGuide seem to agree that despite 40 amps and 2 amps, a safe bet is to go with a “smart charger”.

At 4 amps…

This is good not so much for traveling nor for a long time reservation, but a balanced rate of charging. This is ideal for smaller vehicles like motorcycles or motorbikes and other smaller designed batteries.

In many ways, especially in ampere range, this is not dissimilar to a trickle charger or slow charger. In terms Again, there seems to be no dispute among experts that the type of battery charger investment should be for the “smart” kind. It is a balanced charger and serves a bridge between the different charger current ranges.

So, between these ranges, it is important to check out these possibilities and scenarios on considering where to get a really good charger. Remember, a charger (especially a smart type) can really go a long way to help the charging process in terms of efficiency. So, never underestimate the power of a very, very convenient accessory.

Real Talk Question No.3: Determinations On Overall Car Battery Charging

Okay, so we’ve reached the rundown. As stated way above, the overall charging rate of your car batteries can be greatly affected when two co-factors meet: a dead battery and the ampere – voltage range relationships between a car and car batteries. Why are they important and is there a third co-factor?

Again, a dead battery is essentially in a discharged state and so it will have to take a jumpstart to get the battery cells working through the engine system again. This is important because a discharged battery can corrode over time and may never even jumpstart again according to BATTERY MAN GUIDE.

And again, a car battery charger can affect a car battery charging rate because, in most standardized products of car batteries, their voltage range remains constant. This is important because a high charging rate charger can run the risk of overcharging and a slow charging rate charger can run the risk of undercharging.

But, what about the third co-factor? This is referred to as a “temperature sensitivity” and it has to do with, first and foremost, the temperature of both chargers and batteries. But, more so, it has a lot to do with the temperature of the car batteries themselves.

Specifically, we have to address the important information that can be taken with regards to the material that a car battery that a car battery has. So, under this co-factor, you can list down temperature sensitivity of car battery material.

Of particular note is the temperature that a battery can endure when it comes to recharging. This is especially true when you do not have a “smart: type charger that can monitor temperature sensitivities for you. When such a situation is placed, monitor temperature is placed at a paramount priority.

In this sense, a longer discharged battery will have a rough time going through recharge and will be extra sensitive to new currents of energy (yes, the temperature is a real thing). This, in potential, can lead to the battery having a rather hot temperature upon charging and in that sense, one should be able to stop charging just to stay on the safe side of the operation.

In this co-factor, it is important to focus on reading voltage rate. In this case, experts have recommended the use of a voltmeter to get an accurate, more precise reading on temperature fluctuations. This is important when it regards to what is referred as an “open circuit voltage” or the rate at which the charge is continued or in the process of continuing.

It is thus, recommended, for users to know the state of their car batteries from their last charge-up (this could be from ranges of 0, 25, 50, 70 and 100 percent charging)—put the proper amount of amperes for the right type of charging state. QUICK NOTE: A 12.2 voltage reading on the voltmeter is usually at 50%.

Also, materials matter because of the new science and upgrades batteries are using to help bring more convenience to this charging.

Among materials to be aware of in terms of car batteries are these:

– Lead-Acid
– Gel
– AGM (Absorbent Glas Mat) Technology

Though temperature readings and temperature awareness (hence the recommendation for well-ventilated rooms) is more important, the type of materials used to can bring about changes in terms of how well a battery fills up or tolerates through charging cycles.

In particular…

Lead Acid Types are the standardized types of batteries that people buy. They charge right but has the potential for getting leaks out quickly.

Gel types are recommended as better to lead-acid types as they do not use a sulfur liquid formation (lead-acid does). The problem is that it is also sensitive to overcharging.

AGM or Absorbent Glass Mat types are often touted as a better form of this charge five times faster than the relative models stated above. They are quite helpful in terms of use in marine operations because their charging tolerance can be taken to “deep cycle” processes, which marine operations rely upon.

Overall, to bring the point across, “how long does it takes to charge a car battery” is a question will be determined, most likely, by these factors. So, keep them in mind. And to keep safe.

Some Good and Safe Ways On How To Use A Car Battery Charger

It is said by people with regards to many a thing: do not just ram it in there. And, that is indeed true for many things, from knives on food and to things like chargers and plugin devices. Yes, we would like to think that we know a bit too much when it comes to our devices (and maybe we do) but there are a good number of cases where this is not the case.

And, as convenient as shoving things can be, dangerous situations are near and dear and it would serve us best to get away from them. Case in point, a car battery charger. Think you know them? Well, read on the article to see where you can improve and maybe brush up on things you might not have considered how to use a car battery charger.

Okay, basics of the basics when it comes to terminology: jumpstart. Yes, the same term used for starting up an engine is the same term (and approach, in a way) to startup or hookup a car battery charger.

On the whole, when it comes to using a car battery charger, we need to safely and securely improve the process we jumpstart the charger to battery connection. If we or you can accomplish that, that is pretty much it. Without the “jump”, it may often than not lead to a “spark”.

And no, a “spark” is not a great word when it comes to these things. What comes with a “spark” can either be dead (a mild situation) or alive as in fire (a very bad situation). So, while we know the principle that is needed, the rest of this article will cover a safer (and cleaner) set of methodology that can serve to help you in the long run, if you are interested.

Prepping A Car Battery

All right Here is the easy (but no less important part) of the process.

Check it out:

1. Investigate your car battery manual and your car battery charger. The standard issue of car batteries will be a 12-volt rating for their system. The charging voltage or rates will vary and they can fluctuate depending on the temperature sensitivity.
2. An area that is well opened or well ventilated is encouraged. Just when we were talking about temperature sensitives! In all seriousness though, this is important to charging because of leaks of hydrogen gas dissipate, due to the sulfuric acid that comes the batteries use. It helps that the area is relatively free of materials that cause a fire or is poisonous. Adding to advice, do not forget to remind yourself of wearing extra protection or eyes and other vital areas where gas can cause damage. And do not forget to shut down accessories connected to your car like phone chargers and other equipment.
3. Get to know your battery and its terminals. Batteries have ports that are termed as terminals (shameless laugh) and have energy polarities associated with them (wires too). These polarities are labeled positive (+) and negative (-). The wires associated with them are also labeled with red and black. The black wires are connected with negative (-) polarities and red wires are connected with positive (-) polarities. Please disconnect the negative terminal and positive terminal, respectively. Proceed to remove the battery from the vehicle.

Plugging In A Car Battery Charger

In this part, it is important not to rush in as it deals with items and processes that can greatly aggravate the situation if not observed well.

No rush, take your time. That said:

1. The battery terminals need to be cleaned. Given that you have protective gear already in place, proceed to clean up any corrosive material within the battery terminal. Experts often go to utilizing or using water-based baking soda solutions in order to get this job done. Best to heed their advice. Add in a brush and a cloth to be extra safe (even if you have gloves on).
2. Distilled water (clean water) is to be poured enough to the battery cells. Ensuring this step is accomplished provides a safety precaution towards the dispersion of compounds like hydrogen and its gas.
3. The car battery charger should be away from the battery (if lines permit). The distribution should be side to side but a distance needs to be there in case “sparks happen” (not the good kind).
4. The charger should be within the right amount of voltage. Referring or deferring to manuals is then needed for this. In case of doubt, it is best to start out with a lower setting (even the lowest), if tolerated.
5. Connect charging clips to terminals. The first clip should be connected to the positive (+) end and the second is connected to the ground or negative (-) end. Take extra precaution as you go through these.
6. In an outlet, plug in the charger. Along with the charger itself, a three-pronged grounded plug will be there. This plug should appropriately go into a three-pronged outlet.
7. Let the charger do its thing and wait for a full charge. Again, referring or deferring to manufacturer manuals helps in determining the appropriate charging rate.
8. Disconnect the charger by unplugging. This is crucial and should be the first step in unplugging.
9. Reverse the order when it comes to the clips. The order is reversed when removing the clips you plugged into terminals. So, the grounded (negative) clips should be removed first, and then the positive clips.
10. The (now) fully charged battery is connected back to the vehicle.
11. The cables are then applied in standard order. The positive terminal should be reconnected first and followed by the negative terminal.

Whew! That may have been a doozy, but necessary. All in all, this should help you out when it comes to knowing how to use a car battery charger. Safety counts and with this, it can count for a very long time as a car user.

A Layman’s Guide To A Homemade Car Battery Charger

It can often be daunting (or exciting) to experience the art and science of crafting things with your own hands. Some people can relate to this when it comes to having the opportunity to do their own house or vehicle repairs.

But, possessing the ability and confidence to handle tools that can be useful to everyday life is a great skill to acquire or have. It takes some patience, an open mind and perhaps, more than anything, a willingness to try out and fail on some stuff.

With that said, you might be interested in learning what is important with regards to making a homemade car battery charger.

The central thing that is vital for making a homemade car battery charger is having a transformer, ideally one with a center tap that can produce a 6-Volt to the 12-volt range.

So, above all things, do not forget this important step as it will function as the foundation for the rest of the process. With that laid out, the importance of this transformer is that you need this as a core to making a circuit, which is the hub to generate and transfer the electricity for a charge in your vehicle.

So, in general, it all comes back to this setup (the transformer) when it comes to forming your own circuit and creating your own homemade car battery charger.

There are many methods by this point but if you are interested in knowing more, the rest of this article provides some nifty and relatively simple advice in getting you to that process safely.

This does not have to be the end all be all, but this can come in handy when you are in situations that call for a quick charge or what people in the community call a ‘trickle charge’.

Overview Of Materials Needed For A Homemade Car Battery Charger Circuit

Okay, so as an overview, you will need some kind of:

1. Base Platform to hold materials
2. Material pieces to hold mount on and off the switch
3. A Bridge Rectifier and a Cord and some clips
4. A Glue Gun, some soldering Iron, and some screws

Some of these materials can often become a hassle to get when you do not know your way around the process. That said, these are important when eventually setting up your transformer’s circuit.

The base platform (which can be anything pliable or durable) acts material to hold the whole circuit together. Often, materials like plywood can be used for this since it is often common in many households.

Pieces that hold a particular mount can be tricky but experts often use a steel or aluminum type angle piece in order to get this part of the job done. The Bridge rectifier, cord, and clips are used for the management of the voltage that will pass through.

As with any manual or household garage job, glue guns and screws and some iron are often standard procedure items to have to finish the job well.


The advice involved with using the transformer, creating a circuit can be found here. So, you can take note of them as you go through your own process:

1. First off, you have to mount the transformer and attach a line cord. The plywood base can be made through the use of screws. Proceed to solder the ends of the cord to the transformer’s primary terminals. In this step, a hot glue gun can be very helpful in creating a relief or sticking or joining these materials. Like a good house wall painting session, remember to administer patience and take your time letting the relief set in and solidify properly.
2. Secondly, have a mounted switch wired. The transformer’s secondary terminals must be wired to the switch. Steel or aluminum angle is held at the base with screws. Remember, this is or a switch, so it is paramount that you label the positions of the switch or 6 and 12 volts, appropriately.
3. Third, let us now wire the rectifier. This is often called a bridge rectifier and it can save a lot of fuss and hassle if you have one ready or use. Other than that, a bridge rectifier also needs a base of support like the transformer. You can, of course, use glue for this process. Be careful of producing too much heat in the process and thus, a heat sink can be used when soldering diodes like these. For the AC (input) and DC (output) cords, you can bend them in different directions. Clips with colors can be used in order to know which terminal is which.

Using A Homemade Car Battery Charger

Given a good setup, the formation of a circuit using a transformer should be enough to create a sufficient charge for the given task of charging a car battery.

This said, it can be helpful to pay some attention to these observations:

– Make sure to select 12 volts or 6 volts with the switch.
– Remember to connect a given clip of designated color to the same terminal (black clip to black battery terminal or red clip to a red battery terminal).
– Do keep a lid on how long you let a power cord be plugged in. A standard time to look out for is twelve hours
– Do not forget to disconnect the clips from the battery. This will often prevent sparking that could possibly ignite something unfortunate instead of appropriate charging

All that said, aside from the above observations it pays dividends to take one’s time when it comes to gathering materials for the setup of a homemade car battery charger.

You can never be too sure whether there are new alternatives when it comes to helping manage the process better. Often, without the right materials for the job, the task itself will prove to be a difficult one.

Despite this, there are many different ways of making a homemade car battery charger. Hopefully, this is one that can help you accomplish that very task.

The Best Way To Charge A Dead Car Battery

As owners of cars and boats or vehicles, it can often be intimidating to find oneself in the midst of a dead car battery situation.  On land, you can run into trouble with fading headlights and a possible sudden stoppage in the middle of the road. On the sea, the situation can become even worse (imagine being stuck in the middle of the ocean at night!). Given an immediate survival situation, what is the best way to charge a dead car battery?

To be honest, the best way to charge a dead battery falls into a sensible and hands-on process that requires some observation and of course, some cautionary attitude. Okay, so this process involves a:

1. A car with a functional car battery
2. a set of jumper cables

Essentially, with these two items, you can just transfer the energy from the functional car battery you have through the jumper cables and then unto the dead car battery.

With that said, you can be pretty much on the ready and good to go the next time you run into a situation where you have to charge your dead car batteries. Best of luck to you, my traveling friend.

Oh, also, if you are interested in a more detailed process, please read on below to the rest of this article and you can find some good points to remember when going through specifically this hands-on process in detail.

And, remember friends, it pays to list down the process to have something to remember. In this case, post-it notes can be a really good help as reminders. It can often be very helpful to go about the process step by step in case you need to troubleshoot—no rush and stay calm. All right, let us go head on to the specifics.

Best To Prepare: Investigating Dead Batteries

So, using a jumper cable to transfer energy to a dead car battery sounds like a straightforward process. It looks and sounds like it is.

But, one of the downsides that can be ignored is actually checking out the dead car battery In question. Make sure these procedures are observed before you use the jump cables:

1. Make sure the dead car battery does not have any leaks (especially liquid solutions). It is also a good reminder to pay attention to certain cracks that the battery has.
2. Some like the grease and grind of this type of operation but it is recommended you go wear some protective gear for your eyes and hands when doing this.
3. Your battery cables should be clean. Remember to clean them to avoid corrosion.
4. It is of paramount importance that the car with the spare battery is near the dead car battery. For this, you have to take your time and verify. Jumper cables can only go so far and it pays to close the distance between travel points, especially when it involves electricity.
5. Do not forget to turn off the car with the functional battery.

Jumpstarting The Charge Of A Dead Car Battery

In the jump-start process, the steps observed can often be meticulous based on how well you have the preparation process (see above guidelines) setup. These are really what can either cut or add up to the time needed for the actual boot-up we all want to get.

Given that, observe these steps (slowly, my friends, slowly) in jump-starting a dead car battery:

1. Remember to open the closed hood compartment in the vehicles where both the batteries (dead and functional) are located.
2. Both batteries will have a negative (-) and positive (+) terminal points that are labeled on them.
3. The ends of the jumper cables will need to be placed in the positive (+) terminals of both batteries. A positive ended jumper cable usually has a red color.
4. The order of plugin usually has a standard procedure. The first end of the jumper cable should be plugged to the positive terminal of the dead car battery first and then placed unto the positive terminal last.
5. Now, connect the negative end of the jumper cable (colored usually as black) to the negative terminal (-) of the charged battery (not dead battery).
6. You can now attach the other negative end of the jumper cable unto a grounded metal plate like a chassis, provided it is of little or no paint or rust.
7. Head on to the car with the functional (charged battery) and start up the engine. Five minutes passed is usually a good time for the dead car battery to get a sufficient charge. In any case, you can go over and start to the car with the dead batteries and check with a startup. If it does not start, you can go over to the other car, start it up and add another five minutes.
8. While the dead battery is running for a good five or ten minutes, remember to disconnect the jumper cables in reverse to the order you went with earlier. That is, grounded metal plate disconnects first, then the negative end (black) on the negative terminal of the charged battery and then proceed to the positive ends (red) on the positive terminal of the charged battery and formerly dead batteries, respectively.
9. Take the car for a test drive and see how it goes.

From Dead Car Batteries To Charge Batteries

Also, a case in point. Remember the jumper cable sequence given above? That sequence is standard procedure so that the likelihood of having electric sparks will be low.

Aside from sequence, connecting to the wrong end of the terminals could cause the fuse to blow up and that is not a pretty sight. And, while the method above is a recommended piece of advice, please observe that some batteries might be in need of replacement already.

A takeaway note here is understanding that there may no real one best way to charge a dead car battery. But, there is a reasonable way to it and the process needs to observed well so that accidents do not happen. It is hoped that this advice has helped and remember, keep safe, dear friends.

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Hi, everyone! Thank you for coming by to get to know about us. We are here to publish articles on how to charge your car battery right way so you can have a great driving of your car with the one you love. Did you know that the battery in your car will only last for few years otherwise you will have to buy a new auto battery or recondition it to keep your battery longer. But to avoid this problem there is a way to do is to proper maintain your battery and charge your car battery often. To remind you again, we are here to help you with the reliable guide on related topic of ways to charge a battery from now on. So keep coming back and interactive with us. We are looking forward to talking to you soon.

Charging an automotive battery will give you car run very powerful and sexy. Learn how to charge your car today.