Power Bank Buying Guide

Every year mobile phones incorporate new features that make us more attractive: better panels, a greater number of lenses, facial recognition… However, in the search for more amazing and manageable terminals, we find that beyond wireless charging and fast charging, our mobile phone’s autonomy will not last more than a day. So whether we’re intensive users or we’re not going to be near a plug, a power bak or portable battery wants a handy accessory.

If you are thinking of buying a power bank, this guides buying portable batteries to charge your mobile phone about what to look at when choosing one with some interesting models.


Power Bank Buying Guide |What to look at when choosing a power bank


charge Capacity

One of the fundamental features when choosing a power bank is its capacity, a parameter measured in mAh or milliampere-hours. A quick account may lead us to think that if your phone’s battery is 3,000 mAh and you buy a 6,000 mAh battery, you can charge it twice—Crassus mistake.

The manufacturer’s theoretical mAh does not correspond to reality because of the contribution of factors such as the efficiency of the device itself or the operating temperature. Also, as with smartphone batteries, batteries have a finite life cycle. That is, you will gradually lose capacity.

A good estimate of its actual capacity is to approximate it to 60-70% of its theoretical capacity. Come on; we’ll have to multiply by 0.65 the value specified by the manufacturer. So, if a power bank has 10,000 mAh capacity and 65% performance, you’ll be able to charge a 3,000mAh phone just over twice.




As with mobile phones, where a larger terminal allows to embed a larger battery, the larger and heavier batteries are larger and heavier, so , there is a compromise between capacity and portability in the power bank. Thus, we find power banks the size of lipstick that will hardly allow us to change our entire mobile phone, although they can serve if you want to give it a little push.

In any case, it is worth investing a little more and getting hold of a larger model that allows us to at least a full charge of our smartphone and it is manageable and portable. Greater capacity involves more size and weight, but there are models with a more compact and comfortable design to carry.

As in the market, we can find dozens of power banks models; we will perform some calculations that allow us to find those that offer more capacity in less space and weight. Thus, we will calculate:

  • weight/capacity (g/mAh), where we will be interested in getting as low a value as possible.
  • Volume/capacity (cm3/mAh), where the ideal will be a low value, which will translate into a compact model for the capacity it offers.

As for materials, considering that it is a gadget that we will carry in the bag or backpack, it must be resistant against bumps, falls and frictions, and a little slippery in hand. It is usual to find power banks with plastic or metal housing, and many include a protective bag to prevent scratches and deterioration.

With this in mind, models that hover between 6,000 and 10,000 mAh provide good usability within a lightweight and manageable format.


Ports: quantity, types and charging speed

It doesn’t matter what type of connector your mobile phone has, because to charge it through the power bank, you will use a cable that has a USB port at one end, precisely the one that connects to the external battery. It is important to know that this cable is not included.

Another option (still a minority) is that the power bank allows us to charge our phone wirelessly, simply by depositing the phone on its surface, something interesting if our phone is compatible with market standards, usually Qi.

Also, the power bank is usually powered via a micro-USB port or USB-C. This cable is included when we buy a power bank: eye, just the cable, not the adapter with the plug.

It is important to find a model that has the right ports and know the number of ports (in case you need to charge multiple devices simultaneously) and their specifications. If your phone allows fast charging, it’s a good idea to look for a battery that allows it to take advantage of it. A socket with 5W (5V, 1A) specifications is slow, and 10W (5V, 2A) is fast on a practical level.

We must pay special attention to models that allow charging several devices at once because the electric charge is not evenly distributed, with a tendency to have a fast and a slow port. Fortunately, these types of batteries implement an intelligent system that distributes them.

Charging speed is important, but not only in terms of speed to charge our devices but also for the battery itself to charge. As detailed above, external batteries do not come with chargers, so if the power bank in question can be charged quickly, be sure to use a charger that allows it.


Other features

The power bank is simple and simple devices. Some inform us of their ability qualitatively simply using LED lights that change colour or turn off when the battery runs out. Others are more accurate, providing us with an approximate percentage of their remaining capacity through a screen. However, decreasing the load is not linear, so the light orientation is more than enough.

If you have the idea of using your battery for nature excursions, it will be useful to look for waterproof models and even integrate a solar panel that allows it to be charged outdoors. To this day, they are not the panacea, but something is something. Finally, some models integrate flashlights that can get us out of trouble.

Another feature to keep in mind is that as the batteries run out, they need to be charged to use them again. The best models allow you to charge them simultaneously as they charge your device so that we save time.

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