All smartphones work as smart as they can when those are fully loaded with power. When the charge is out of the smartphone it sleeps as early as a human being. Power is essential part of smartphones. Smartphones completely depends on the power because most of the all smartphones comes with wide screens, high processor and multitasking capabilities. If you see S4 it comes with all the extraordinary functions of usage including games and more fun elements. If you are a game lover and you always likes to play games that gives more fun and freshness to your mind if the smart phones are out of the power then they makes you annoying.
To avoid this situation my best suggestion is using a power bank, it should contains an external battery with the sealed case. To charge the power banks you can connect it with a USB cable to your notebooks it easy way to get it changed. In some cases you can use the flip out blades for plugging to the walls. In both ways you can use the power banks to get it charged. It is easy to carry the power banks and USB cable with you while travelling. Power banks can carry in your pockets, wallets, backpacks, baggage and whatever you are holding with you. It is a necessary travelling accessory when your smartphone is out of charge and it is started blinking the golden sign in your phone, just plug in the power bank to your Smartphone and use wherever you are and enjoy your fun and important issues.
Power banks are rated in mAH(milliamp hours), same as the battery in our cellphones, The efficiency is in between 70% to 80%; the rest of the energy will be loosed due to the heat supplied by it. Therefore the 3600mAh power bank is not able to give the total changing to your S4’s 3600 mAH battery. 4400 mAH unit also fall a bit (check the calculations 0.80 X 4000 would be less than 3600). The other way is try to use the power bank before the battery of smartphone is completely empty.
The review states that 1 Amp ports are used for the smartphones. After evaluation the units are 5600 mAh and more also can use up to 2.1 A or 2.5 A power output can be considered power supply for smartphones and tablets.
There is no specific terminology for Power banks, some companies named it as external batteries and some call simply as power banks. There is no exact name for power banks yet for smaller as well as larger power banks. The latest mini Powerocks Tarot is popularly advertised now which gives 1500 mAH baby clad sleek aluminium body which provides 3600 mAH power supply to about 1/3 full if you started using before completely discharged in your iPhone 5 smartphone. The measurement of a powerbak can compare with a credit card height and width, it is as thicker as credit card and easily fits in to your pockets.
The other power bank gives 10000 mAh units of charge. It comes in two different colors black and silver. The body of this looks like a lipstick or a mini flash light which is cylindrical in structure actually but looks simple and don’t hesitate to think about lipstick structure because it appears in unisex model. Therefore easy to carry and trendy.