Capacity
This is one of the main criteria. It is measured in milliaper hours (mAh). Everything is simple here, the larger the number, the more times you can charge a particular gadget. For example, in order to fully charge a smartphone with a 4000 mAh battery, you need a power bank of 5000 mAh or more.
Why not 4000 mAh? The nominal capacity is indicated on the power bank, but the real one is always less due to the inevitable losses due to energy conversion, different operating voltages of devices and the provision of protection and other functions of the power bank.
The difference can reach 40%. That is, even a 20,000 mAh power bank, at best, will charge a smartphone at 4,000 mAh no more than three times. Thus, when choosing, this point should be taken into account.
For guidance, consider the following indicators:
3000-5000 mAh – suitable for charging a smartphone, headphones or camera once, as well as smart watches and other small gadgets 5000-10000 mAh – will help charge a smartphone or tablet 1-2 times , and also allow you to simultaneously charge several gadgets 20000 mAh and above – they provide an even greater supply of energy and are recommended to be taken on long trips
output power
Each gadget – smartphone, flashlight, tablet, portable speaker, etc. – has its own maximum charging speed. And when choosing, you need to make sure that the output power meets your needs. Usually it is indicated on the device, for example, 5V / 1A or 5V / 2.4A. The more current, the faster the gadget will charge.
Standard USB A and microUSB connectors output 2A current at 5V, that is, the power is 10W. In this case, charging the smartphone will last for hours, the power bank itself – even longer. However, such parameters are typical for outdated gadgets.
The norm for modern models is considered to be power from 18 to 25W. It is provided due to the fact that power banks support a higher voltage of 9 or 12V and a current of up to 3A. And such operating parameters are inherent in USB A and USB-C connectors.
There are also more powerful solutions at 60 or 100W for USB-C output connectors. They guarantee fast charging of smartphones with a large battery (if they support this function) and are suitable for those who want to charge a laptop.
Input power
It is indicated on the power bank itself. The higher it is, the faster the power bank charges, provided that the charger delivers the required power.
Connectors
All ports are divided into inputs and outputs. The former are needed to charge the portable battery itself (indicated by the letters IN), the latter to charge your gadgets (OUT). More attention should be paid to the outputs when choosing.
They may be different. Some models have only USB, others may have USB-C and microUSB, but usually more than one. Compatibility with rechargeable devices directly depends on this.
Some may have an incoming Lightning connector. This means that such a power bank can be charged with charging from the iPhone and iPad.
Additional functions
Individual power banks may have a built-in flashlight, a display to indicate the charge level, or, for example, support wireless charging. The latter works if the appropriate protocol is supported by your smartphone. As a rule, these are the latest iPhone models and flagship solutions from other manufacturers.
What you need to know when choosing a power bank for a laptop
In this case, capacity and power indicators may not be enough. Due to the high voltage, the laptop battery requires more power to charge. That is, the capacity must be at least 20,000 mAh. And better – even more.
The ability to charge a laptop with a power bank depends on its connector. Easiest with modern models equipped with USB-C interface with support for PD (PowerDelivery) technology. However, some are still equipped with DC ports, and their connectors differ in size depending on the manufacturer and model. In this case, you will have to look for a special adapter.
At the same time, it is not a fact that a laptop with an incoming USB-C connector supports the Power Delivery standard. If you connect a power bank to it, it will still not charge.
Moreover, a large capacity and the presence of a USB-C output do not guarantee recharging the laptop. Here you need to pay attention to the inscriptions on the power supply, which indicates the power consumption in watts. If it is not there, then there may be designations for voltage (W) and current strength (A), then we get the power by multiplying these numbers.
Thus, for example, to charge a laptop with a power consumption of 60 W, you will need a power bank that supports an output power of at least this value.
2023-08-26 03:00:00
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