Today i will show you how to make a really cheap and easy "hack" for making the capacity of your power bank bigger

Step 1: Find a "not-so-old" Useless Laptop Battery

You can use really any battery

Step 2: Break the Rules!

Take it apart, carefully, and separate the batteries

Step 3: Put the Batteries Together

The positive side of the cells have a "line" on the side, get all the positive sides together, as shown (badly) in the picture.
Do the same with the negative side.

Step 4: Disassemble the Power Bank

Find the positive wire (red) and negative wire (black), and connect the negative side of the batteries to the negative of the power bank, do the same thing with the positive. Tape it all up, and you are ready to go.