The first thing to do is to check the smartphone battery capacity. If it is for primary use, then you should consider two times the capacity of the battery. This means that you can use it to recharge at least twice. When you have a portable battery that has more USB ports, it means that you can charge your devices at the same time if you have many. You should also consider how fast you would be able to charge as this is a feature that is very important. Ensure that the cable is compatible with this.
You should choose the number of parts based on the use you intend for them. If you just have a single phone, then a single USB should be enough. This one goes without saying. Portability is very important. Having additional power is an amazing thing and it should be easy to carry around or it beats logic. Smaller capacities are usually smaller in size. You should never buy a portable battery that proves difficult to carry with you. It should be of a high quality too, regardless of the size and should be able to serve the purpose that it is meant for.
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