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Picture of How to Make Power Bank on Your Own Easily
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In this instructables I will show you how you can make your own power bank using easily available and inexpensive components. This backup battery contain 18650 li-ion battery from old laptop or you can buy new ones. Later I made a wooden casing with cool looking Plexiglas lights to have a cooler aesthetic feel. I will walk you through each and every steps in building this.

Watch the video for easy understanding

The specifications are:

Capacity: 6600mAh (Expandable)

Output voltage: 5V

Step 1: Materials Required

18650 li-ion battery

TP 4056 battery protection module

6009 Boost Converter module

LED

330 ohm resistor

USB female socket

Soldering kit

Switch

Plywood ( 3/4" and 1/4" thickness)

Some basic woodworking tools like Drill, hacksaw, Chisel,etc

Junlaine6 days ago
First, In 6600mAh you can have or attain the output voltage of 5V. Why you need the Step up Booster? (Phone required only 5V for charging).

Second, one Battery is equal to a 3.7V, then using a Step up Booster you can get an output voltage of 5V, that is correct. The question is why you need the 3 battery's and a step up booster. The 3 batteries with a capacity of 3.7V each are equal to or with a total volts of 11.1V. The requirements only is 5V to charge the phone. Meaning to say if you put the 3 battery together, it is over power.

Revise your explanation. Dangerous to follow through.
OctaveP8 months ago
quite dangerous as is! read @MaxxB1 comment :)
MaxxB18 months ago
The TP 4056 battery protection module doesn't do load balancing, so charging 3 cells from one module will not work well. Once the unit sees one of the three cells is at it's limit, it will stop charging or stop the battery giving power.
To get this to work correctly you need 3 TP 4056 battery protection modules. One connected to each battery. The USB input from one module can be used to power the other two modules by soldering jumper wires to the +/- contacts on the USB end of the module.
The output of the three modules can be joined in parallel to provide the power to the boost convertor.