How to choose an external battery for smartphone
Educational Program How To Choose / / December 19, 2019
Every year there are new smart phones, more and more powerful and voracious. Innovations in the field of batteries is not expected, and therefore, power bank (pauerbank, external battery, laptop battery) remains the only option for those who are often away from home to outlets.
The different external batteries
Portable power sources, as opposed to those same smartphones and other types of advanced technology, can not boast of a special variety. And it is quite logical. Batteries - they are the batteries, but something about them still need to know.
Capacity and related dimensions
The most important parameter is the external battery its capacity, which the manufacturer typically specifies a milliamp-hours (mA⋅ch). Roughly speaking, the amount of energy that can be stored (but not send) battery.
Note: in view of the fundamental laws of physics no external battery can not transmit 100% of the stored energy and no smart not able to completely absorb the received energy. Part of the resource is always lost when converting voltage, and a certain amount goes into heat.
The average total loss is 30 to 40%, although individual (and usually more expensive) batteries and external models smartphones boast efficiency of about 90%.
Thus, to determine the number of chargings smartphone possible with the known capacity of the internal battery pauerbanka with known capacity by a simple division incorrectly. It is necessary to take into account the loss factor. And for reinsurance is better to take it at the upper end, ie at least 35%.
Put simply, the pauerbank with the stated capacity of 10 000 mA⋅ch in practice will give about 7500 real mA⋅ch and then fully charge a smartphone with a battery capacity of 2500 mA⋅ch not four times, but only three.
Please note that The above calculation is very pretty and the averaged optimistic. Check real loss when charging a particular smartphone the particular external battery only in practice.
In addition, the physics of mandates that a direct correlation between capacity and weight pauerbanka. To store more energy, the battery has to be heavier and more.
connectors
The vast majority of external batteries, and especially low-end modelsSold without cables. It is assumed that you will use wire bundled with the smartphone. Accordingly, the connectors on the battery and the cable should be the same.
It may seem that pay attention to the connectors is not necessary because all smartphones the same cable with a standard USB full-length on one end and microUSB on the other, but it is not.
For example, the complete cable Nexus 5X on both sides of the USB-C. And not to buy additional wires have to look for an external battery with such connector, with both output and input or purchase an adapter.
Some manufacturers, such as Motorola, include a set of individual smartphone models with non-removable plug wire. In this case, the purchase of an additional cable is inevitable.
There pauerbanki-wired. In this case, it is important to make sure that the connector is suitable for your smartphone.
Output power of the external battery fast charging current and
External battery charging smartphone, and it's wonderful. Even better, if it does so quickly, right? Charging speed depends on many factors, but the determining factor is the force output pauerbanka current. It should be no less than that offered by the smartphone manufacturer.
Learn the optimal amperage for your smartphone easy. Take the plug that came with the device, and look at the value OUTPUT.
There will be written something like 5 V - 2 A. You need a figure standing next to A, because the strength of the current is measured in amperes.
Learn pauerbanka force output current can be in the description or instruction. If the external battery is more than one output connector, the current strength is sometimes stated directly on the body next to each connector.
If there are two or more connectors need to remember that the total output power of pauerbanka current is limited. For example, the battery can have two outputs, each of 2.5 A, but issue of not more than 4 A. Accordingly, when connecting two devices at once, each of them will be able to receive up to 2 A.
If the output power of the external battery current is less than that for which the smartphone is designed (for example, 1 And pauerbanka and 1.5 A in the smartphone), then the charge will still occur, but much more slowly.
Not to be feared, if the external battery output amperage above that for which the mobile device is calculated (e.g., at 2 A 1 A pauerbanka and a smartphone). Mobile devices have built-in protection, limiting the value of the incoming current to an acceptable value. Simply put, your smartphone does not explode or melt.
For this reason, your mobile device will not charge more quickly if you use a fork or pauerbank with the output amperage above provided by the manufacturer.
Suppose you found an external battery with a suitable output power by force, but a complete fork still charges the smartphone faster. What's the matter? Most likely, your smartphone supports some fast charging technology like Quick Charge 3.0, Quick Charge 4.0 or version with its own name from the particular manufacturer (eg, mCharge from Meizu). Look pauerbank who befriends specifically with the rapid charging technology that is used in your smartphone.
Now gaining popularity pauerbanki with clever technology such as fast charging PowerIQ. In theory, they recognize them to be connected to the device and serves the optimal amperage for him, but in practice it works not always and not with all models of smartphones.
The input power of the external battery current
Whatever capacious external battery you may have bought its own energy supply, sooner or later it will be depleted. It's nice when pauerbank quickly charges the smartphone, but even nicer when he quickly charged.
The rate of charge is determined by its input pauerbanka amperage, voltage and availability of a technology providing more rapid replenishment of its own charge. Now there are external batteries that are fully charged in less than 30 minutes.
Please note: private pauerbanka charging rate does not affect the rate at which it charges your smartphone.
But the lack of understanding of the technology and the gaps in knowledge of English can confuse users. For example, you see pauerbank that says something like 5 minutes charge. You might think that this miracle device charges smartphone for 5 minutes, but in reality everything is different.
Suppose a specific battery capacity 10,000 mA⋅ch and it will be fully charged in 20 minutes. Then 5 minutes later he will fill approximately 2500 mA⋅ch. And this charge is really enough to charge a typical smartphone.
The problem is that the smart phone charging time is limited by its own maximum input current strength and the presence of the support of a technology fast charging.
Simply put, pretentious phrase 5 minutes charge really means: "This pauerbanku enough 5 minutes to get the charge required to fully charge a smartphone future." Do not get caught on the marketing Suck noodles and their technical competence.
The best external batteries
Layfhaker offers to make a library of top pauerbankov. Write in comments the name and characteristics of the models that are in use, and your opinion about them. If a comment on your model already has, plus his and complement their experience of use.
Models who receive the most advantages, will fall into the selection of "best external batteries 2017", which we will publish.
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