How many amps to charge your phone. Wireless charging: the watch is at risk

How many amps do you need to charge your phone?

There is always a number on the unit that indicates the maximum current, when it exceeds the limits, the charging can go into protection and completely shut down. That is, when the flagship uses during charging more than 1 amp, the weak charger will not charge the device.

But it’s all individual. The device may behave differently, for example, if the current is low, it will certainly charge, but very slowly. It is also possible to switch the power consumption from high to low inside the phone, when connected to a certain charger. In addition, if you connect the flagship via USB, for example, to a computer, the charge does not use more than half an amp.

All this is determined not by the charger, but directly by the “brains” built into your smartphone. So, you can disprove the theory that you should only use original chargers. You can also use non-original, but only if the difference will not exceed the value of 4 or more. In such cases, the device due to high fluctuations can fail.

Do not be afraid to charge your flagship from a block of 2 amps, even if the original dictates us 1 amp. But sometimes, the phone doesn’t really accept other chargers and can simply charge slower, even if the unit is stronger. We recommend all cheap chargers from unknown companies to check the functionality with a special device. Be sure to pay attention to the behavior of your phone when connected to a new charger, if it hangs or behaves incorrectly, you should refuse to use such a power supply.

How to measure the charging current of a phone battery?

Switches in a very simple way: charge. this tester. USB cable. your device, in other words in series (between the charger and the phone). With this tester you can roughly measure “how many mAh will be poured into the phone” and thus find out the battery capacity! Convenient and most importantly cheap. about 200 with shipping.

If the phone is charged with 1-2A currents, then in any, except 1A. Every year the phone manufacturer increases the capacity of the battery, so the charging power needs to be higher, but you do not have to stick to it. A phone with a 2A charging current can also be charged from 0.5A.


For phones, smartphones. equipped with one USB-output for connecting the appropriate equipment. Output current is 1A.

For tablets. has one outlet for tablets. The output current is 2.1 А.

Important: maximum current of 2.1A output current is available only when one device is plugged in. If two devices are being charged at the same time, the charger will “give” current of 1 A. If you charge the 2.1A with a 1A charger, it will take longer to charge.

Universal. compatible with smartphones, tablets, wireless headphones, e-books, fitness bracelets and other portable equipment. Such models are equipped with several USB-outlets for charging gadgets from one outlet. A good choice for frequent travelers: you don’t need to take a charger for each device and can get by with one charger and a set of cables.

Universal chargers also include USB chargers with several plugs. One end of the cable connects (via USB port) to your computer, laptop, ROM, and the other (via connectors) connects it to the gadget that you want to recharge.

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USB charger powers phones and smartphones of different brands, tablets, cameras. Such device is not expensive, but its functionality is limited by the presence or absence of computer, laptop, ROM at hand.

Important: When using the universal USB charging device you must take into account the input current parameter. the current in the devices from which the device is charged. This feature will affect the battery charging rate of the connected device. But not all power sources provide much current. For example PC USB-port has an input current of 500 mA.

For smart watches. such chargers are mostly wireless and are made in the form of a round platform with a cable/USB-connector for connecting to the device with this connector.

Important: different charging technologies are used in wrist devices. Therefore when buying a charger pay attention to its compatibility with your model of smart watches.

Standalone PowerBanks for phones

How many volts should the charger output?

The battery gives out 12 volts, but in order to charge it, the charging voltage must be greater than the battery voltage. 6.55 volts will not do us any good here. The charger should give us 13 to 16 volts.

Ideally the charging current for a typical lead-acid battery should be 10% of its ampere-hour rating. For example, a fully discharged 50 amp-hour battery should be charged at 5 amps for ten hours. Charging should be done with the covers off or the plugs removed.

It just fell and hit the knife. Eight times in a row!

Not so long ago there was a shocking discovery floating around the Internet. It turned out that a person is killed not by 220 volts from the socket, and the number of amperes! This “discovery” immediately reminded me of the anecdote about the mother-in-law who slipped and fell on the knife eight times in a row.

Naturally kills the knife (amps). But the knife itself is perfectly safe, unless it’s held in the hand by someone capable of stabbing. And the stronger its muscles will be (volts), the more dangerous the knife will be (amps). In the weak hands of a one year old (very few volts), even a sharp knife (very many amps) will not pose any threat to a person.

And to continue the conversation, we need to define the terms right away. If you know volts and amperes very well, and you understand Ohm’s law, then I don’t think you’ll be interested in this article. And you shouldn’t have any such questions. So I warn you right away, the phrase “for dummies” in the title is there for a reason.

What is current??

Imagine an ordinary piece of wire. Tell me, does it have current in it? I don’t think you’re going to do any experiments connecting this wire to a light bulb to answer my question. Obviously, there is no current there.

I think that many people know that current is the movement of electrons. If there are electrons flowing/crawling through the wire, then there will automatically be a current in the wire. But then where do the electrons in the wire come from?? It’s the power supply or the battery that’s pushing them in there?

In fact, the electrons that are going to be crawling along our wire are already inside the wire. Because wire, like everything in our world, is made up of atoms. And these atoms, like parts of a construction set, come in all shapes and sizes.

Take gold, for example. You hold a bar of gold in your hand and it’s immediately clear that it’s not a piece of aluminum. But if you crush that lump into smaller pieces, how long will the substance remain gold? The correct answer is down to the size of one atom! And by looking at two different atoms, we have no problem determining which one is gold and which one is aluminum.

And it’s not that the gold atom is yellow or shiny in the sun and the hydrogen atom is liquid and transparent. Of course not. It’s all about the atomic nucleus, or to be more precise, the number of protons that make up the nucleus. If an atom has 79 protons, we know that it is gold, and if it has 29 protons, we know that it is copper. No matter how many electrons we tear from an atom, the atom always remains gold or copper.

If we could somehow add four protons to the copper atom, it would become 33 and the atom would no longer have anything to do with copper, it would become arsenic. By the way, these numbers (number of protons) are indicated in the Mendeleev table next to each element.

So, protons (blue balls on the picture above) have a certain charge, we call it positive (“plus”). And around the nucleus float electrons, which also have a charge, but opposite to the proton charge. We call it negative (“minus”). It is through electrons that atoms can connect to each other, creating all objects, substances, and matter. These electrons, like Velcro, stick atoms together:

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Protons always attract electrons to themselves (“plus” and “minus” are always attracted). But the more energy an electron has, the farther it can fly away from the nucleus with the protons. And the farther it is from the nucleus, the weaker the bond with it. Such an electron can break away from the nucleus altogether and fly away with the ends, because it is repelled by other electrons (“minus” and “minus” always repel).

So, if we affect the wire with some force, the electrons farthest away from the nucleus will start to break away from the atoms, crawl a short distance and join other atoms, and their electrons will respectively break away and fly to the next atoms:

Again, this movement of electrons in one direction is called a current.

What are amperes and volts?

Current is the movement of electrons. But how do we describe the strength of the current? You could, of course, just call it the number of electrons crawling through the wire in one second.

Like saying, “Don’t touch that wire, there are 12 million trillion electrons floating around in a second!”, or write on the sign, “Beware, 30 quintillion electrons crawl through here per second.”.

You have to agree, it sounds kind of strange. We can’t even fathom or imagine these millions of trillions or quintillions.

So we decided not to count electrons one by one, but to count them at once in groups or “packs”. After all, what good is the charge of a single electron to us? It is negligibly small and unable to do any useful work.

Such a “pack” (group) includes 6,241,509,074,460,762,607 electrons. And the total charge of these ~6 quintillion electrons passing through the wire in 1 second, they decided to call an amp:

If we say that there is a current of 2 amps (2A) going through the wire, that means that there are physically about 12 quintillion electrons crawling through there in 1 second (26.241).

By the way, you probably noticed that I use different words to describe movement of electrons: crawl, float, fly, etc.д. I do it because I do not know the best word to describe this movement.

One might think that the electrons are moving along the wire at crazy speeds, because the light bulb goes on instantly when we touch the switch. In fact, to call this speed “crazy”, to put it mildly, is not quite right.

When you plug in the power supply and plug in your smartphone, one particular electron that “flies out” of the power supply into the wire at that moment will go directly into the smartphone itself in about 33 minutes. Yes, it will move forward no more than half a millimeter per second.

isn’t it harmful to charge your phone with a high amperage charger??

It is harmful, it can burn out the display (not immediately but gradually). It will get to the point where you can see almost nothing on the display, everything will be in black and not transparent spots.

now let’s think together. What is voltage and how does it express t. What’s the unit of measurement? I guess the question is about amps.that’s? think voltage?

No harm. The phone has a built-in charge controller, it regulates the battery charging current. So when you choose a charger, it is important that the current it gives out is NO LESS than the current the device needs. The voltage should match and the current can be as high as you want. P.S. Some Chinese computers can give 15 amps via USB, and they give it so much that the connector burns out, but the phone doesn’t care.

The main thing is that the voltage corresponds, or was a little less.

smartphone or phone does not matter the device will take as much ampere as necessary, simple and clear language explained) Load ampere is needed only in the event that the tablet needs 2 amps and stick one, but it does not charge when you play and if you stick two it will pop the main thing not to stick weaker amperage and that would be consistent with a voltage of 5 volts for example

The voltage is the primary basis for the voltage. у. and overcharging it threatens any battery to fail. It makes no sense to apply a higher voltage if the controller will cut it off. second output parameter z. у output current. If you do not pay attention to this parameter, there can be serious problems as well: The battery of your cell phone is several times smaller than the battery of your tablet. almost that many times the charging current of the tablet should be more. Otherwise, it will take you a long time to fully charge. besides the low power z. у. will noticeably heat up, which is not far from an accident. a larger output current is. у. only benefit, but every extra amp makes it more expensive. у. notebook USB port has only half an amp and therefore categorically does not allow charging the tablet. cell phone can.

Bombs away from the nubia. I explain. the battery is not charged by the charger, not the battery itself, not the phone. The battery is charged by the charge controller. The charger just gives you the current. The controller will take as much current as it needs. It won’t take any more. The main thing is not to mix up the voltage. It could be 10,000 mega amps. But if the voltage is not 5 volts, but, let’s say, 7, then the controller can fail and you have to change it. But there’s no USB charger with more than 5 volts. USB only allows 5 volts. Any device can be charged with absolutely any charger. If the current is low/the voltage is low, the charging just won’t start. If there’s a lot of current. hushima. The controller will take as much as it needs

All the answers are bullshit. The phone will take exactly what it needs.

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TABAC!! GOGEN. AIDS!! You must have overexposed the phone to the sun to get a black screen or whatever. You can’t do that with a charger!

Amps is a consumed unit! The charger says how many amps it can give and the consumer will take as many as he needs!

12 volts from the phone charger

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Checking the phone charger for performance.


I can’t find any information on how much is 3A, and how is it divided if I have two devices plugged in? I understand that if one device, it gives it these supposedly 3A. If two, it is divided in half? The salesman mumbled something to me, I didn’t believe it.

And the main question is this. how harmful or not harmful to power the tablet from such a charger, which.

View Full Version : Charger for the phone

Lost the charger from a Chinese phone C-92. There was one that was universal. you could charge the battery without the phone, and had a USB connector to charge the phone through a USB cable (the phone supports charging from the USB port.

Now I charge the battery with the charger “frog”. The charger gives out a current of 50-70 mA at 4.5 V. I usually put it on overnight.

Decided to make a network charger. I measured the current and it turned out that with a discharged battery phone pulls from 400 mA, the charge goes some periods. for 20 seconds, then the charge is not going 1 second, and so it repeats. If you try to limit the current to 100-150 mA, the phone displays the message “Bad contact in the charger” and charging stops.

Hence the question: Is this normal and you need to make such a charger, so it gives the current which pulls the phone?

The charging current can be bouncing, the output current of the charger should be at least 600mA, more is possible. less is impossible, and.

USB to PC gives 5 volts and 500mA

Charges most PDAs, communicators, and navigators at 5 volts and 2 amps (2000 milliamps)

So it will charge via USB, but slowly. Car chargers are usually designed to cut off the charge when the battery is fully charged. If you cut all guts out of it, then, in order not to burn the navigator, it is necessary to put the bridge (it is called a stabilizer, I think). I have done so. I put the breaker, the charger outputs 5 volts and 2 amps. The only disadvantage. the Kremenka is very warm, while screwed to a small heatsink. In the future, I want to screw to the cooler from the stump of the first and all this packed into a nice little box.

It is necessary instead of a bank to use a switching regulator, the Chinese car chargers for navigation devices is such, gives a current of up to 2 amperes, and is not warm at all, those that are sold for 200 tenge with USB outputs are weak for the navigator, giving only 0.4 amperes, can still.

I faced a problem with the lack of power when connecting a communicator on android. at the same time working GPS navigator and DVR, the battery is discharged faster than the charging goes. With the original 100% battery, even connected to the onboard network of the car sits at zero for a few hours of operation in this mode.

At first I thought that the charger I was using did not have enough amps at the output. I bought a few more powerful (1000mA and 2100mA). but the result was not as expected, the picture has not changed.

I have no knowledge of electronics, so I would like to hear the Комментарии и мнения владельцев of knowledgeable people.

After googling a bit, I found the following statements that interested me:

The maximum charging current is the current the battery charger is capable of delivering. And it will give out exactly as much as the consumer eats. If you want 100mA at 5A, it will consume 100mA at 5V, even if you get enough current from a 5V source.

What you need to know about charging smartphones

I am periodically asked all sorts of questions about charging smartphones. For example, “Why does my iPhone takes three hours to charge, but the One Plus 5, which my husband has? Literally an hour?”Why the same One Plus 5 charges for up to four hours from another adapter?”Why does my laptop port charge for six hours, but my husband’s laptop port charges for six hours? For a little more than three hours?There is a universal adapter that would charge all smartphones equally quickly,” “Samsung TV does not see Wi-Fi?”, “How do I know if any adapter fits my smartphone or not??”, “Which adapter can be used to quickly charge a smartphone in the car?”. etc.

The smartphones were charged at the same voltage value for a long time. at 5 volts. The maximum amperage, which also determines the charging speed, was 1 amp.

Battery capacity is defined in milliampere hours (mAh).

If the power adapter produces a true 5V/1A, then a 2000 mAh battery should theoretically be charged in about two hours (1000 mAh per hour) from such an adapter, but in practice it would take three hours. Because up to 50% of the battery is charged at maximum power, and then the full current is no longer taken, so the remaining 50% percent it will take two hours to charge.

A normal computer USB port (USB 2.0) produces 5V, but no more than 0.5A. That is, from it the battery with a capacity of 2000 mAh will charge in about 5-6 hours.

How to see how much current your smartphone receives when using one or another type of charging? There are special devices for this, but it is all possible to find out from the smartphone itself. For each smartphone manufacturer makes the so-called engineering menu, which is called in a strictly defined way after reboot. a lot of different parameters are given out there.

However, there are ways much easier: for example, the program Ampere (or similar, there are many), which is under Android (under iOS used to be, is not detected now, but there are analogues). You install it, run it. and check how much current your smartphone is getting. If you use an adapter, and the current is about 0.5A. it means there is something wrong with either the adapter or the cable. (Note that these programs do not always correctly determine the charging current, but you can still use them.)

For example on this phone the software says that the smartphone gets 1.8A (which is 1800 milliamps).

In any case it is worth checking what current your smartphone gets when charging it, even if you use an adaptor attached to the phone. (Especially with cheap Chinese phones.) And you have to check all other adapters you use, because with cheap adapters you might find that they do not even get 1A and the adapter does not even reach 0.5A and it takes your smartphone a long time to charge.

Also the cable you are using might have some influence on the charging speed. The cheaper and the lower quality cable you use, the lower the charging current, and the voltage, too. And sometimes it happens that the adapter gives out its true value of 1A, but because of the cable to the smartphone comes, for example, 0.3A and 3.5V voltage. So in this case you need to test different cables and check the charging current on your phone.

For normal brand smartphones. Samsung, Sony, HTC, Huawei, Lenovo, ZTE, Xiaomi. You can usually count on the cables that came with your phone: those manufacturers won’t put junk in the box. And with some cheap smartphones from little-known manufacturers, everything can be possible, so you will definitely need to check.

I use cables from tried and tested manufacturers. RoyalFlag, Fonken (here is, by the way, the Fonken on Ali), I also usually take kits of different sizes: the longer the cable, the more losses when charging, so if the adapter is located near the smartphone, it is better to use a shorter cable. But remember, a longer cable from a reputable manufacturer is better than a short one from who knows who.

What’s going on with our iPhones? Iphone fast charging technology is still unknown, modern iPhones can be charged at 5V/2A, but Apple only bundles a single-amp adapter, so the time to charge the iPhone from its charger. About three and a half hours. And if you use an iPhone adapter for the iPad, which produces 2A, then the iPhone will charge up in half the time. Or you will have to buy a 2A adapter separately. Apple is selling it, as usual, for quite a bit of money. It’s Apple, kids, it’s Apple.

Things are a lot more interesting with android phones. For them, it has been several years since they have invented various fast charging technologies. But there is a certain amount of confusion about these technologies, because there’s no single standard for fast charging that all manufacturers support. Attempts are being made to create a single standard, but some manufacturers support them, others. no. Besides, the top manufacturers create their own fast charging technologies which are supported only by their devices and their adapters (sometimes also only by their wires).

Let’s find out what it is and how it works. And to answer the question if the rumor that fast charging kills the smartphone battery noticeably faster.

It would seem that since the higher the current, the faster the charge. Let’s increase the current! But it is not possible to increase the current to infinity. It will have a bad effect on the battery. There are also smartphone port restrictions.

It is believed that the maximum safe charging current of the battery is related to its capacity. For a 3600 mAh battery, the maximum amperage. 3.6 A (well, actually allowed a little more. up to 5 A). For a 2200 mAh battery, the maximum amperage. 2.2 A (up to 3 A).

An important factor that affects the charging speed. is the power output of the adapter, measured in watts. And power, as we know from high school physics course. is the product of the voltage on the current. That is, if we are not allowed to increase the power, we can increase the voltage. the power will be more, the smartphone will charge faster. (At the same time, the charging controller has become much more complicated.)