Phones. They are almost always in our hands. Day in and day out. Powerful portable minicomputers which are controlled by our grubby fingers to give the outputs we desire. No wonder they are so prized! Now that phones are being taken practically everywhere, people also need a portable power source to charge their devices on the go. And those are power banks.These handy stores of electrons nowadays pack a powerful punch in a bite - sized package. Charging phones, receiving charge quickly and more. However, these lovely creations come with a price. First is the deprivation of Earth's resources due to mass production. Second is the pollution of the environment by incorrect recycling. Third is the price. The literal price. Most decent power banks cost north of $10 today! That is why I have constructed a guide on how to build a simple power bank with used phone batteries and a module for around $3 - 4. (Minus the price of the equipment)
