Power banks are the portable chargers that are used to charge the drained battery of your mobile phone with the help of USB port inbuilt in it. There are different brands of power banks, among them the most commonly used is the Ambrane Power bank. Ambrane is one of the best manufactures of power bank, which are available mostly in black and white color. These Ambrane power banks can be used as the best promotional tool by any organization to their clients and employees. The companies can also inscribe their name as well as logo into it.