It is impossible to imagine a modern person without one or even several mobile gadgets. And no matter how advanced and expensive they are, when the battery is discharged, everything turns into a set of electronic components in a beautiful shell. In order not to be at the right moment with a discharged gadget, you need to think in advance about purchasing an external battery.
At first glance, "power banks" are no different from each other in functionality. But still, there are subtleties that should be considered when choosing an external battery.
Capacity
The main parameter of any storage battery. The unit of measurement is milliampere-hours (mAh). The capacity of the external battery must be at least three times the capacity of the gadget's battery. The higher the better. It should be borne in mind that due to physical laws, losses occur during the transfer of energy from the "powerbank" to the gadget. In fact, you can count on 65-70% of the declared capacity.
If you plan to use an external battery to replenish the energy of not only a smartphone, but also a tablet or laptop, then you should purchase a device that can provide all gadgets with a charge. But when traveling by air, it is important to know the airline's rules for the carriage of external batteries. Many companies prohibit the transportation of devices of a certain capacity or lack of marking on the case indicating this parameter. There are also bans on the transportation of a certain amount of batteries.
Output current
Modern smartphones are equipped with high-power chargers. In this regard, it is very important to purchase an external battery with increased charge current output. Smart electronics of gadgets will pass the maximum amount of current without harm to their components.
Input current
The parameter characterizes the charging rate of the battery itself. Very capacious "power banks" with a minimum charging current will charge for a very long time. Everyone decides for himself the importance of this characteristic, taking into account his daily activity.
Output connector
Most external batteries are supplied without any mains cables as standard. It is assumed that cables from the kit of the charging gadget will be used. Not the most important parameter, but you should make sure in advance that a network cable can be connected from a smartphone to a "power bank". After all, the cost of a quality cable will change the final price of an external battery.
Body material
Plastic or metal alloys are the main materials in the construction of enclosures. The main difference between them is the mass and strength of the device. With careful handling, it makes sense to choose an external battery based on design and build quality.
Other parameters
A number of secondary parameters and functions can be highlighted, which, when choosing a device, will be bonuses to the purchase.
… Power banks of increased capacity are completed. A convenient function for charging multiple gadgets, especially with friends or colleagues.
… Allows you to calculate the "strength" of the powerbank and put the device on charge at the time.
… A handy feature, but not in all cases. It should be understood that the power of a wireless charger is not great.
… A function of dubious utility, but once a year might come in handy.
… The larger the capacity, the larger the dimensions. Cylindrical, prismatic or cubic form of external battery, select only by the user.
… Everything is simple here. Poorly fitted housing parts, flimsy control and display elements, loose connectors. In favor of such devices, the choice is obviously not worth making.
… The more eminent the brand, the more high-quality product you can count on. But do not forget about the significant markup for the brand. When purchasing a product from unknown manufacturers or dubious sellers, there is no guarantee that the declared capacity will coincide with the actual one.
It is worth focusing on additional functions and parameters solely from your needs and financial capabilities.
