1.
capacity: perhaps the most important selection criterion is just the capacity, or how many
milliampere hours (mAh) of energy they store in their own battery. Most power banks are in the range of 10,000 to 30,000mAh, but there are also larger ones: 50,000 and even 70,000mAh. The greater the number of devices you want to charge from a
powerbank, the more capacity you will need. And importantly! Also keep in mind that about 30 percent of the theoretical battery capacity is lost in the form of heat and resistance.
2
Ports: of course, equally important is the number and type of ports we have available. With
several output ports, you can charge several devices simultaneously. But you need to pay attention to the type of ports (USB-C, USB-A, Lightning, Micro USB, etc.), as well as the
power and current they provide. This information gives you an idea of how fast your phone or tablet will charge and what kind of cables you will need.
3.
size: in general, most portable battery chargers are
small in size. But there are a range of other sizes, shapes and weights of powerbanks. It's worth considering
where and when you plan to use portable chargers. If you want one that will fit in your pocket or hand, then you should look for a powerbank that is slim, cylindrical or particularly compact and lightweight.
4
Charging time: A portable battery charger is only useful when it is best to charge itself. You need to check how long it takes to fully charge
the powerbank. The higher the capacity, the longer the charging time. However, the best portable battery chargers have fast
input ports for fast charging, or
two input ports, so our powerbank can be charged with two cables at the same time, in half the time.
5
Price: And another argument that is taken into account when buying a powerbank is, of course, the
price. On the plaster we can find many solutions in different price ranges. Portable chargers with a capacity of 10,000mAh can be bought for as low as about 10USD, larger ones with a capacity of 20,000 - 50,000mAh can be obtained for about 30 - 70USD. It is also worth remembering that in addition to the extra capacity, you will pay more for a powerbank with multiple high-speed ports.
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