Introduction

       In the last few years, our world has greatly improved technologically. And the use of batteries has also greatly increased due to all the high-tech portable devices now available. Alessandro Volta discovered the first practical way of producing electricity. Thanks to him, we can now have a safe and reliable way to power up our hospitals in case of a severe power failure. Imagine a world without portable devices. No cell phones, no walkie-talkies, no laptops, no cars and no airplanes. Wireless would not exist, and since batteries are so important, everyone should know how they function.