Cell phones use pouch batteries, aka prismatic cells. Laptops almost all use 18650 cells, which are cylindrical and look a lot like very large AA batteries. C

Cell phones use pouch batteries, aka prismatic cells. Laptops almost all use 18650 cells, which are cylindrical and look a lot like very large AA batteries. Coin cells are just really simple. They're pretty standard for proving your battery works. The thing is that there is a huge difference between that and a real useful battery. You can pay a grad student overtime to build a coin cell of about anything. You need a machine to make a pouch cell. It's like if someone showed you a go-kart and said they could make a car. They share the same elements and everything, but there's a definite world of difference between them. It's a lot more than just being bigger.