Perhaps the most important for many is how much battery capacity the portable battery offers. How much you need depends on what you’re charging. A gadget with a large battery requires a larger power bank
to charge more than once. A good benchmark is to have dual capacity in the portable charger.
Power banks have at least one input to charge its own battery, and one output to charge a connected device. The number of outputs differ between models, but most common is at least two connectors for simultaneous charging of multiple gadgets.
Select a model based on the number of outputs required, and the power sent to the charged devices. Cheap chargers are often limited to 1A, which means they charge modern mobile phones and tablets slowly. At least 2.1A per output for faster charging is recommended.
For the fastest possible charge of the power bank, it is best to choose a model that can handle 2.1A or more, even at the input. With the right charger in the plug socket, it can provide twice as fast charging compared to a portable charger that only gives 1A input.
Power banks are small and handy
One thing that many probably miss is that it takes several hours to recharge the larger portable chargers. A model of 12,000 mAh
can take up to eight hours to fully charge. It’s a good idea to start charging it in good time if you plan to take the portable charger on a trip or the like.
One of the benefits of a power bank is that they are often small and handy to bring. It may be tempting to choose a model with extra-large battery capacity, but keep in mind that the physical size of the charger increases with higher capacity.
Some power banks have additional features like a built-in torch, water resistant design, and support for wireless charging. If you know that the device is going to be used outdoors and for extended periods of time, a model with solar power operation may be practical.
Another tip is to choose a model with either LED indicator or LCD display, that shows how much power remains in the device.