The first batteries were made in the 1800s and have changed a lot since then. The reason batteries come in so many types has as much to do with history as innovation.

Apple Watch models do come in different sizes, 44mm and 45mm in the Apple Watch Series 8 range, for instance, and the larger size models do have bigger batteries and, therefore, better battery life.

To understand why batteries come in many different sizes and shapes – and serve many purposes – look to the past, at how batteries originated and how they have developed over the years.

The round batteries, small as buttons and shiny as coins, are prized for the energy they pack at their size. In households, they have become commonplace, powering remote controls, hearing aids ...

Hue unveiled a redesigned Smart Button, larger in size and different in aesthetics, but with the same functionalities. The Smart Button still requires a Hue Bridge, can control individual lights or ...

It'd be an understandable set of difference if all three were just 100mAh different – that's negligible. But because the Galaxy S10's two battery sizes are 200mAh different, the reality of the ...

To understand why batteries come in many different sizes and shapes – and serve many purposes – look to the past, at how batteries originated and how they have developed over the years.