16. Multi-battery powerbank

For this project, you can create your own power bank by using the Li-ion batteries found on laptops. To increase its capacity, connect the batteries in parallel, from positive to positive, and negative to negative. 

<Powerbank w/ insides>

In the FINAL DESIGN in 2016, which consisted of not 3 cells, 5 cells, or even 7 cells in parallel. Instead, it was 10 CELLS in parallel, which gives a theoretical capacity of over 25,000 Mah w/o the circuit, though when using it, there was a power conversion from 3.7 volts to 5 volts so it will be a true capacity of 20,000 Mahor below. The reason why many cells are used in this project is due to the fact they are recycled, and so they do not hold up the charge as a brand new Li-ion battery.

<2017 Powerbanks>

Still, that was a lot of power capacity for such a small container. In fact, all the 10 cells were literally crammed in the case (purchased from home depot), and so I have to install the circuit outside the container. 

This plastic container was the starting point of the power bank project, not only does it has high-quality looks, and the apprentice that it looks indestructible(somewhat), it also has plastic screw tabs, which when done right, you can mount it on a wall, making a 5-volt POWER-WALL.

<Front view>

Ether way of how you design your power bank, it will function as any other power banks, charging your phone on the go, or whether or not a power source is available at the time.

Also, when you are building devices that utilize Li-ion batteries, know that they can get dangerous when they are handled improperly. Make sure that the battery charger is suitable to charge these Li-ion batteries.

<Circuit, though the cells are Li-Ion>