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Before purchasing any battery charger most especially Power bank, there are some basic features you put into consideration which will enable you find a battery charger of better quality. If you're interested to know these features, then keep reading before grabbing one of the best power banks online. My first key consideration is;
•Power Bank Capacity
Capacity of a power bank is the basic feature of a portable and durable battery charger. It determines the amount of electrical energy it can store within itself and can utilize the same while charging your mobile devices.
Battery capacity has its unit as mAh. You might have seen figures written on batteries and power banks like 10400 mAh, 5200mAh, 2600mAh etc. These figures or capacities rather, are established by the multiple of 2600 mAh. This is because the base of a Li-ion battery cell is 2600 mAh.
So before buying a power bank, consider the battery capacity, and to know this, take note that as the battery capacity gets bigger, so as the frame of the power bank increases. So don't just look at what is written on the frame and make conclusions there.
So, go for the highest capacity that your budget allows.
Li-ion and Li-poly
Li-ion and Li-poly two variation of the battery cells commonly used to formulate the best power banks. Most of the battery packs go for the Li-ion because of its cheaper cost of purchase and this made portable chargers being constituted with Li-ion become much bulkier in comparison to the Li-Poly.
Pass through charging
Another feature to put into consideration is pass through charging. At this point you may be thinking what i'm trying to make you know of!
It is simple, any power bank with this feature would be able to power up itself (self-charge) and simultaneously, charging your smartphone(s).
On a normal ground, this feature ought to be present in every power bank as it seems rudimentary, but most power banks miss this important feature. One power bank that offers this time saving feature is the Huawei 13000 mAh power bank.
•Input and Output current rating
These ratings determine how rapid your power bank and the devices gets charged. Typically, they come with a rating of 5V at 2.1 A and 5V at 1 A. Obviously, 2.1 A rating would be more preferable as it will make the device charge faster.
However, for a 2.1A rated power bank to get charged fast, you should also use a 2.1A rated wall charger, using a lower rated charger like a 1A rated wall charger that is usually more prevalent will be counter-productive.
Number of charging ports
Number of charging ports on power banks plays the relevant role if you wish to charge multiple devices simultaneously. Usually most of the portable chargers below 10000 mAh capacity (smaller capacity) does not come up with multiple output port option. The reason is obvious; they are simply not large enough to charge up more than one device at a time due to their low capacity.
It is important to know that the number of output ports possessed by a power bank affect the output current when charging multiple devices simultaneously.
An example is the Mi 16000 mAh power bank, which has two USB output ports (whereas the 10400 mAh variant has only one output port) and claims to charge devices at a rating of 2.1 A, 5V.
However, this claim is only true when charging only one device at a time. When you use both ports at the same time, this particular power bank is capable of providing a max of 3 A at 5 V (i.e. 1.5 A per port).
It is a nice idea to go through a reliable power bank review about a certain portable charger to get to know more about these specifications for that particular power bank.
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