The main feature of a bank is its capacity, so you should always pay attention to this parameter when buying a new device.
During the operation or purchase of such a product by hand, it becomes necessary to check the product, that is, to determine the ability to accumulate a certain amount of electricity. This article explains in detail how to measure the capacity of a bank in different ways.
What power supply is in the Power Bank
Before you start measuring the capacity of a portable energy storage device, you should know exactly how the device is arranged. The power bank consists of a thin case in which several ordinary cylindrical batteries are installed, which are connected together in parallel.
In this case, the capacities of all the elements add up, which allows you to charge a smartphone or phone several times in a row from such a product without having to install a portable battery to recharge it.
In addition to the batteries, there is a controller in the bank that will disable charging of the cells when a certain level is reached. In addition, many devices are equipped with a light indication indicating the level of charge or discharge of the internal batteries.
As a rule, rechargeable lithium batteries are installed in banks. 18650 batteries . Depending on the manufacturer, the capacity of these power sources can vary widely. For this reason, it will be useful to control this parameter during operation or immediately after purchasing a bank.
Where is the declared capacity indicatedThe capacity of the cells of the 18650 battery is always indicated on the body of the power source, but for this purpose it will be necessary to disassemble the product. Such a procedure cannot be carried out without the use of brute physical force, which can cause irreparable damage to the appearance of the product.
It is much easier to determine the capacity declared by the manufacturer by studying the instructions for use. On the packaging, this information can also be duplicated, so if the original bank box is kept, you can easily determine the nominal value of this external battery setting.
How to check the capacity of a bank
The capacity of the bank can be checked in several ways. The most popular method is the multimeter method.
Using a multimeter
Multimeter is a universal device with which you can easily measure resistance, voltage, or current. You can also determine the capacitance with the help of this device, but for this you need to perform not only measurements of some parameters, but also perform some arithmetic operations.
To check the capacity, in addition to a multimeter, you will need to select a load, for example, a small electric motor or an incandescent lamp.
You will also need to connect an ammeter between the bank and the electricity consumer. The resulting value should not exceed the maximum specified in the documentation for the portable battery.
Knowing the discharge current, in order to obtain the product capacity in mAh, it is necessary to know the real time of the device from a fully charged battery. After one hundred percent charge, the load is connected to a portable power source and the timer is activated.
The test stops when the device stops operating at full power (the incandescent lamp decreases, the motor lowers the speed, etc.). To determine the capacity, the resulting time in hours is multiplied by the current in amps.
Via USB tester
As a rule, banks are equipped with a standard USB connector, so you can use special testers to determine the capacity. Such devices are compact and inexpensive.
USB battery tester
Unlike the above method, where it was necessary to calculate this parameter, when using a USB tester, it is enough to connect it to the circuit between the charger and a completely discharged battery. When charging is complete, the device will display the actual capacity level of the internal batteries on the digital display.
The advantages of this method are its simplicity and its high measuring speed. In addition to the capacity, these devices can display in real time the voltage and strength of the current consumed.
With Smart Charges
This method will require removing the batteries from the bank case. For this purpose, you need to carefully disassemble the portable product. Then unsolder or disconnect the batteries and install them in the charger. Such a method should only be chosen if the first two methods are impossible for some reason or another.
After installing the batteries in the charger, they are fully charged, after which the built-in program will accurately calculate this parameter. If all the batteries in the battery were connected in parallel, to get the exact value of this parameter, you will need to add the capacity value obtained from each cell.
How true is the data claimed?
Unfortunately, the parameters indicated on the parcel or the bank passport often do not correspond to the actual values. There is a great risk of purchasing poor quality product when ordering goods from various online sites.
Xiaomi Mi Power Bank 3 pro 20,000
You can protect yourself a little from the acquisition of such devices if you look at the reviews of real customers who have already tested the bank after the purchase.
Purchasing products from reputable manufacturers will avoid the risk of purchasing poor quality devices. The maximum deviations of the capacity value in such devices do not exceed 10%. In addition, branded products are backed by a long term warranty, which will allow you to return money or get another product in the event of a defect.
Many users prefer wireless charging for all the devices they use, whether it's a phone or a Power Bank. Some users are unfamiliar with the principle of the convenient function built into many modern mobile devices, banks and other gadgets.
What is wireless charging and how it works
There is a wireless transmission of information at a distance thanks to special sensors such as Bluetooth, Wi-Fi. Wireless charging is a modern technology of transmitting electricity at a distance. Such devices are equipped with a module to create an electromagnetic field. The standard used in these devices is called Qi.
The main work is carried out by structures from induction coils, which serve as receivers and at the same time translators of electricity. When you turn on the power supply of such a load to the network, a voltage is generated around these coils, which passes through an electromagnetic field.
When a person brings a smartphone into this area, the wireless charging function built into the gadget is activated. And the magnetic waves are converted into electricity and enter the battery of the device. Recently, developers have made more and more diverse devices with wireless charging.
Is there a Power Bank wireless charging function c
At present, not many manufacturers have started to produce power banks with wireless charging function, but the main thing is to set a trend that other companies will safely adopt.
Still on the market today, there are devices in a wide variety of colors and materials, whether plastic, metal, glass, wood or even leather. It can be in shockproof and waterproof case. There are devices for two phones or a phone + smart watch, as well as equipped with a solar battery.
However, the user's smartphone must also have a function through which he will receive energy from the bank. Otherwise, this function will become unnecessary. If your phone does not have one, you can buy a separate module that connects via USB to your smartphone.
Which mobile devices are compatible
The wireless charging stations are compatible with all mobile phones equipped with an energy transfer module. These are the following types of gadgets:
|Apple iphone||8, 8 Plus, X, Xr, Xs; Xs max|
|Blackview||BV9500, BV5800 Pro, BV9600 Pro, BV9500 Pro|
|Samsung galaxy||Note 8, Note 9, S7 Edge, S8, S8 +, S9, S9 Plus, S10, S10 +, S10e|
|Google Pixel||3, 3 XL|
|Huawei||Mate 20 Pro, Mate 20 RS, Porsche Design Mate RS, P30 Pro|
|LG||V30, V30 +, V30S + ThinQ, V40 ThinQ|
|Nokia||9 PureView, 8 Sirocco, Lumia 1520|
|Sony Xperia||XZ2, XZ2 Premium, XZ2 Premium Dual, XZ3|
|Xiaomi||Mi Mix 2S, Mi Mix3, Mi8 S, Mi9|
|Zte||Axon 9 Pro|
And a few others. As a rule, the manufacturer in the technical specifications notes that there is a module for remote wireless power generation. And the phone is on sale complete with this kind of charger adapter.
How to use Power Bank with wireless charging
Before using the device for its intended use, it must be fully charged. After the lights of the gadget are on, indicating that the capacity is full, you can connect a phone or tablet.
Instructions for using an external battery with a wireless power transmission module:
- After the external battery is charged, connect the adapter for wireless charging.
- As a rule, the order of connection is written in the accompanying documentation. On some models, the "On / Off" buttons are used, with which this function is activated and deactivated. On other models, these buttons will need to be held down for at least five seconds to activate remote power transmission technology. On the third models, the function is automatically activated. It all depends on the price category of the device.
- Place the smartphone on it or on the original adapter that connects to the Power Bank via a USB cable.
- Once the device is charged, the power transfer stops automatically.
What to look for when choosing a load
When choosing a power bank, you should pay attention to its capacity. If it is 30% more than the charged device, then such device should be taken. Since this stock is useful in the following situations:
- long battery life in the absence of electrical networks;
- use the appliance outdoors during the cold season;
- A large amount of energy is consumed while playing games or surfing the internet. In this case, a good power supply from an external battery will not hurt.
Once the user has determined the capacity, you need to check the verbank for the compatibility of the USB connectors and cords with the gadget you want to charge.
Technical specifications should not be ignored either. This includes:
- weight and dimensions. The more compact and lightweight it is, the more convenient it is in your pocket;
- housing material (plastic or metal);
- Battery Type;
- maximum output and input currents;
- time of a complete charge cycle from a conventional power supply network with a voltage of 220 V.
And only after all of the above is it worth choosing a device for design.
Best power bank with wireless charging
Popular power bank table
|Last name||Capacity||Max flow||Advantages||Disadvantages|
|Baseus wireless charger||8000 A / h||2 A||Lightweight and comfortable, versatile,economical||Slow charging speed, do not support different amperage on USB ports, there is no way to charge two gadgets at the same time|
|Qi Wireless||8000 A /h||2 A||Lightweight and convenient, low cost, two kinds of USB output, fast charging||Heavy button presses|
|Qi compatible||20,000 Ah||2 A||Compatible with all devices, suitable for both iPhone and Android||Slow charging gadgets|
|Devia - JU||8000 A / h||2.1 A||Two USB slots, economical option||Reviews do not support some Samsung models|
|CaseGuru CGPower||8000 A / h||2 A||Short-circuit protection, device overload||Not detected|
|Hoco B32-8000 Energetic||8000 A / h||2 A||Eliminate accidental phone crashes, compact modern design||No instructions in Russian|
|Interstep 10DQI||12000 A / h||2 A||Compact, fast and durable charging, reliable||Not detected|
|Cactus CS-PBHTWL-6000||6000 A / h||2.1 A||Modern design, fast charging, economical option||Small capacity|
In the market, now it is possible to buy any wireless charging device that meets all the buyer's needs. But first of all, you need to determine the characteristics of your future purchase and check the compatibility with the user's electronic gadgets.