A power bank is able to offer you power until the mains comes back on. The major advantage of a power bank is that it is able to give you the freedom to charge a battery when there are no other options. Power banks are always handy and this is why they are becoming increasingly popular among users
Benefits of Using Power Banks stated by Chipman:
It's very useful when you have a power cut at your home or no electricity area.
Universal Cell phone battery charger
Faster charging because these are high powered devices.
It can be recharged easily by attaching to any USB port.
Power banks are always giving freedom to use the smartphone without worrying about its battery.
Shell Material: Plastic Charging Devices: Electronic Devices Input Interface: Micro USB Battery Type: Li-polymer Battery Features: Built-in Cables Battery Capacity: 10000mAh Supports Solar Energy: No Support Quick Charge Technology: No Output Interface: Double USB Type: Portable Power Bank Weight: 230g Feature:: Power Bank 10000mAh With Digital Display USB Output 1:: 5V/1A USB Output 2:: 5V/2.1A