While looking for more batteries during a recent power failure, I came across some D-size alkaline cells in the back of a drawer, in their original package (see photo) with the price and store name ...

Rayovac D: The most affordable D battery, suitable for bulk purchase with acceptable performance. Energizer 9V : Hard to justify due to its higher price and failure to outperform the competition.

In contrast, when temperatures drop below 32°F, alkaline battery voltage takes a big hit. Heat negatively affects both alkaline and lithium batteries, with lithium performing slightly better.

Shopping for batteries? Read about types, features, and other must-know topics in our battery buying guide to make an informed choice.

Sometimes I’d flip open the battery slot of a rarely used toy to find a crusty, whitish discharge from a leaky AA inside, or I’d leave the ’90s-era rechargeable batteries juicing up on a ...

This year we evaluated 13 alkaline and 2 lithium batteries. Our test scenarios were based on typical battery usage in toys and in flashlights. Our toy test mimicked an hour a day of continuous play.

Skip the battery tester and use this quick and easy way to test if your batteries are dead: Just drop them. The video above by electrical engineer Lee Hite explains why dead batteries bounce, in ...

A look at the science behind batteries, including the parts of a battery and how these parts work together to produce an electric current that can be carried in your pocket.