Portability, weight and style design – sleek and slim designs are good. Light power banks are portable, but be careful with those higher capacity labels but too light to carry. There are power banks that are fake labeled.
Capacity – depending in your gadget requirement and preference, capacity is important. But do not get too large capacity that you cannot maximize its use. Larger capacity of batteries brings higher risk of danger.
Dual ports, - having a dual port can able you to charge two devices at the same time.
If you are planning to buy one, carefully read customer reviews, choose a good brand when it comes to gadgets, there are potentially dangerous unbranded power banks. When you already have one, read the maintenance guide and the risk guide to avoid exploding batteries. Do not leave your chargers overnight.
