Korean designers have proposed a rechargeable 1.5V battery in a memory foam case that could squeeze down from D to AAA-sized. People think deeply about everything, even batteries.

Home batteries can help keep the lights on when the power goes out, but you'll need to find the right size battery for your home. What Size Home Battery Do I Need? - CNET ...

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.

Slate senior editor Andy Bowers explains why we only see standard-sized batteries like AA, AAA, C and D ... Slate's Explainer: No More A and B Battery Sizes. December 25, 2003 12:00 AM ET.

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.