The Physics of Batteries

How does a sealed metal cylinder the size of your finger store enough energy to power a phone all day, and then do it again thousands of times? What actually happens inside a lithium-ion cell when you plug it in? And why do batteries fade, swell, and occasionally burst into flame?

Batteries are the quiet engine behind almost everything electric, and this book takes them apart from the ground up. No physics degree required, no heavy math assumed. Starting from atoms, electrons, and simple chemical reactions, it builds a complete picture of how energy storage works, all the way to the electric vehicles and grid batteries shaping the future.

Inside, you'll discover:
- The electrochemistry that turns a chemical reaction into usable current
- What voltage, capacity, and energy density actually measure
- How the major chemistries differ, from lead-acid to nickel to lithium-ion
- Why lithium-ion became dominant, and how a cell is really built
- What happens during charging, and why fast charging strains a battery
- The real reasons batteries age, and how to make them last longer
- Thermal runaway, battery safety, and how fires start
- Solid-state cells and the emerging technologies coming next

This is the clear, honest guide to the hidden technology powering modern life, from the first voltaic pile to the batteries driving the electric future.