Charging a smartphone through a computer pros and cons of

What will happen if you charge the smartphone from the laptop

Modern phones have been significantly improved, but users have to pay for new functions of short autonomous work. If you constantly use the smartphone for entertainment, visiting the Internet or phone calls, then the battery usually discharges in half a day (5-7 hours).

charging, smartphone, computer, pros, cons

A message appears on the screen with a request to connect the device to the electric network, and there is a problem. Often there are no free outlets nearby. You can always recharge the phone from a computer or laptop. Just use the USB port. We will consider the advantages and disadvantages of this method.

What power supply is needed for wireless charging?

The efficiency of wired charging is about 97%, that is, there is practically no energy losses. But the efficiency of wireless charges fluctuates at 60–75%. In theory, in spherical conditions in a vacuum, so to speak. In reality, the efficiency of the QI standard is affected by the position of the phone at the charging station (that is, the position of induction coils relative to each other), their characteristics and sizes.

charging, smartphone, computer, pros, cons

This year, technological news sites vied with the “study” of an enthusiast who compared the speed and energy consumption of wired and wireless charges. Naturally, the results were not in favor of the latter, and the efficiency of induction charging varied from station to station and especially depended on the position of the smartphone on them. If you take the efficiency of wired charging for 100%, then QI efficiency varied from 20% to 53%, and the best result was shown by the original Google Pixel Stand. 61%. True, the study was not devoted to speed or heat generation of wireless charges, but by their energy consumption. The author led the reader to the conclusion that if at least half of 3 billion smartphones in the world to charge the air with such efficiency, energy consumption and load on the energy networks will increase. On the one hand, you can’t argue with mathematics. On the other hand, an disappointing conclusion is held at the probabilities of “if, if, if energy consumption in the world is already growing due to the digitalization of society.

Is SUPER FAST charging BAD for your phone?

By the way, take the USB tester into service with which you can measure voltage, current and transmitted energy. Such a gadget costs about 1000, but allows you to accurately evaluate the quality of USB cables and output parameters of charging devices. Archpoleous thing on the household!

Based on the low real efficiency of induction charging, we come to the need to connect a charger to a power supply unit. If the 5-watt station is connected to a 5-watt memory, then due to losses, the charging speed of the smartphone will be most likely no, because the resulting power on the smartphone’s receiving coil will be slightly higher than the energy consumption of the phone in the waiting mode in the standby mode. Manufacturers of QI stations recommend the use of power units with a capacity of 30–40% higher than that of Qi charging. So, Apple for its new 15-watt Magsafe for the iPhone 12 recommends buying an adapter with a capacity of at least 20 watts. Fortunately, Apple is not necessarily produced. We compared the charging speed of the iPhone 12 Pro via Magsafe, connected to the original 20-watt Apple adapter and to the tiny Anker Nano for the same 20 W. The difference between the two power supplies is laid in an insignificant error. 188 minutes in the case of the Apple 20 W and 190 minutes paired with Anker Nano 20 W. And when charging from these power supplies, not through Magsafe, but directly through the cable, the battery managed to charge in the same time at 104 minutes.

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By the way, about Magsafe. Formally, the new Apple charge is compatible with all the iPhone with a QI receiver, but only the iPhone 12 family will be charged with a maximum capacity of 15 W, while the previous models of the smartphone are only 5 watts. The observers also noticed a strange incompatibility of Magsafe with powerful power supply for MacBook-paired with a 96-watt Magsafe adapter “swayed” only up to 10 watts. It is believed that the necessary power profile required for magsafe is simply not “sewn up” to the laptop adapter.

Previously, we also advised to purchase for our wireless charges a power supply by about 40% more powerful, but now the most powerful qi stations, such as Anker Powerwave II Stand, we simply equip the necessary capacity with a network adapter. If there was no cable with your Qi-shipment, buy a good wire guaranteed to be guaranteed-cheap nameless USB cables often cannot transfer high currents, and even 0.5 A does not conquer the least quality cables.

How it works?

Each phone or tablet is designed for a certain current strength and voltage. It’s good and bad. It’s good that the phone is protection for yourself, it is bad that it will not work to charge a regular phone, letting go of a larger current.

Such adapters, as it were, expand the “doorway”, and provide faster charging the device, allowing the device to take more voltage and current strength. For example, if old devices supported 5V and 1A, then new gadgets work already from 9V and 2A (this is as an example, the values ​​may be higher).

If you connect Quick Charge charging to the old device, nothing bad will happen, the device will not burn, but it will be charged with the same pace. So here we need a smartphone (or tablet) and charging with support for the Qick Charge standard.

Is it safe for the battery

All that is done within reasonable limits. This statement is the best suited for our case. Frequent charging with “weak current” can provoke a decrease in the nominal capacity of the battery, which, in turn, will lead to an accelerated discharge of the phone.

Another problem was voiced by scientists from the American research center. In their opinion, there is a frequent change in voltage and current parameters in USB ports. The consequence of this is the formation of a large amount of thermal energy. Having analyzed the results of their experiments, scientists said that regular heating of the battery up to 40 ° C for several months is harmful to its capacitive characteristics, reducing them to 65%.

However, in such models, for example, Xiaomi Redmi Note 4, this charging option is supported, as evidenced by the notification in the form of an inscription: “Charging from USB”. And since such a function is laid in the gadget, it cannot be harmful to it.

There is also a threat to infect the computer with viruses. If this happens with its computer, then this is half a bastard, and if with a stranger? Therefore, we open the section in which the phone settings are performed and select the mode “Only Setting”. It is clear that this will not affect the battery in any way, but there will be such a problem, not to say about which it is simply impossible.

We can say that if you really need, then you can charge a smartphone through a computer almost always. The main thing is not to abuse this, and everything will be fine.

“Simple Fix” for phone not charging/syncing, loose cell phone charger cord. Works in 2022, #20

Why do I think that this is the future?

10 years ago Wi-Fi in hotels was considered a comfortable chip. Now is a necessary thing.

2 years ago Payment through NFC. It was new and almost nowhere was used. Now. Almost every second payment in Russia is made contactless.

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In the near future. Wireless charges will be in all new phones, hotels, restaurants, cars, tables.

For example, you can take England. In hotels, hostels, network restaurants there are already wireless charges. Now there are about 5,000 of them, but the number of charges is actively growing in France, Germany and the USA. Even in Russia there are several network establishments that also set themselves charging.

Wireless charging map in England on the left, right. A map of pubs. The potential is huge 🙂

The technology works not 100% yet. There is also a potential for improving it (increasing the charge zone to 2-3 cm, capacities up to 20W and some more commercial improvements for the charging of the markete mass), but now the pluses of such charging outplay the disadvantages.

In a few years, the lack of wireless charging will be equal to the absence of Wi-Fi at the hotel today-you will not even stop in this place.

In the Комментарии и мнения владельцев, opinions were written about low efficiency, danger to humans and other terrible things.

Therefore, here are links to Articles 1) efficiency of wireless charging 2) about the need for the exact hit of charging 1B1 3) about interference for other devices. There is no confirming information. It is not clear how charging creates any interference.

Why you can not charge a smartphone from a computer

Specialists who oppose the charge of the smartphone from the computer give as the main argument possible damage to the battery. The fact is that most often users are connected to a USB-huts computer, from which a smartphone is already running. Either charging the device from USB-shares on the housing. It is important to know that the current of such connectors (like USB hubs) is not able to provide sufficient for smooth, but fast, charging the device voltage. Because of this, the smartphone from such connectors will be charged longer than if it was charged directly from the USB port of the motherboard or from the power source connected to the outlet.

Please note: this problem is especially relevant for USB 2.0 and below. Charge speed from USB 3.0 above, but still does not reach the charge from the power source, especially if it is equipped with fast charging technology.

charging, smartphone, computer, pros, cons

In addition, a smaller charge of negative charge affects the most battery of a smartphone. Accordingly, if you constantly charge it from the laptop, over time it will become worse to hold the charge and begins to discharge faster.

We must not forget about another danger of connecting a smartphone to a computer. These are viruses. A small number of users really care about the antivirus safety of their smartphones, while they have long become the goals of attacks on the part of attackers developing viruses. Viruses for smartphones can be very different: miners (consuming the resources of the device), trojan (capable of stealing personal data), pests (capable of turning the smartphone into “brick”) and so on. Viruses can easily be on a smartphone if it is regularly connected to a computer via USB, even if you do not send files to it.

Important: it is especially dangerous to charge smartphones from other people’s computers and laptops, since you cannot be sure that these devices are not infected with viruses.

charging, smartphone, computer, pros, cons

Charging from USB can be accelerated by half

The time required for charging gadgets from a USB port can be reduced by half and even four times. This requires only one small device called Chargedr, outwardly reminiscent of a flash drive or a small adapter.

Recharging devices through a USB port is very popular. This method of replenishing energy attracts with its simplicity and versatility, although it also has a pronounced drawback-due to the fact that the current issued by the USB-deposit differs in its characteristics from that which makes a charger of a particular gadget, a lot of battery charges from the USB. Time or it becomes impossible at all. Gadget owners are forced to pour patience, and sometimes spend additional funds, for example, buy a voltage stabilizer Yekaterinburg or Moscow, not to mention smaller settlements, cannot guarantee stable voltage in the mains of charging through a USB port, if a power supply source The stationary PC is acting.

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Fortunately, progress does not stand still, which, in this case, is expressed in the appearance of Chargedr-devices with a USB-deposit in the rear, where you need to insert a cable-adapter. Chargedr exchanges data with a gadget power control chip and adapts the outgoing current to its requirements. According to the developer, this procedure is absolutely harmless and allows you to reduce the charging time several times. So, to make up the battery of the Samsung Galaxy Tab 10 battery, 350 minutes are required, through a USB port using Chargedr-only 250 minutes.

Is it possible to charge a phone (smartphone) from a computer via a USB port?

This question is asked by users who, for example, do not have the opportunity to charge their mobile device from the network due to, say, losses of the charger. However, there is a computer or laptop nearby, why not “recharge” from it? Is it possible to do this, what are the pitfalls?

Noticed that when you connect your smartphone to the computer, he immediately begins to charge? Due to certain features, charging the device from the USB port occurs much longer, but after some time the smartphone will still charge. There are no contraindications against charging from the USB port of a computer or laptop, although there is an opinion among experts that a smartphone charged from a USB port, and not from the network, will be discharged a little faster.

What happens? It turns out that you can charge a smartphone from a computer, although it is preferable to do this from network charging. By the way, pay attention to the fact that this relates only to phones and smartphones. As for tablets, some models do not charge from USB at all. There are no such problems with smartphones.

By the way, another interesting moment. It is believed that USB ports that are on the front of the system of the system unit cannot provide the necessary current for charging a smartphone-it will be charged, but this process is stretched for long expectations. In addition, there is an opinion that charging in this case can negatively affect the battery of the device, although it can be noticed not immediately, but a few months or even years after the start of operation. Conclusion-it is better to use USB ports that are on the back wall of the system unit.

Another question is whether it is possible to charge the device all night from a USB port? This question is asked for the reason that the batteries of some mobile devices during prolonged charging sometimes simply burned down. This does not threaten modern devices, since they use a special control chip that monitors both energy consumption and its entry. If the charger is regular and there are no problems with the control chip, the charging of the smartphone will be automatically stopped as soon as it is charged by 100%. And how much do not charge the smartphone from the network or USB port, it will not be charged after the specified threshold.

Result. You can charge a smartphone or phone from a USB port, but it is better to use charging from the network. There should be no problems when charging from USB if the device is charged all night.

Is it possible to charge a smartphone from a computer

This topic worries many owners of mobile devices. Is it possible to charge the phone from the computer via USB? I watched a lot of videos, studied the question on the forums, collected all the information and decided to share the conclusions with you.