Here's a quick way to test if your AA batteries are dead


It's pretty obvious when your alkaline batteries run out of power — the flashlight or camera or toy or whatever stops working. But what about the out-of-package batteries lying around your house? Sure, you could find or buy a battery tester. But electrical engineer Lee Hite has an easier test: Just drop your nonrecharable AA battery — or AAA, C, D, or 9 volt — on a hard surface and see if it bounces. If the alkaline battery bounces, it's dead (or near dead); if it doesn't, you're good to go. Watch Hite's video below for his explanation of why dead batteries bounce. (Hat-tip to Digg) --Peter Weber
Subscribe to The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.

Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
A free daily email with the biggest news stories of the day – and the best features from TheWeek.com
Peter has worked as a news and culture writer and editor at The Week since the site's launch in 2008. He covers politics, world affairs, religion and cultural currents. His journalism career began as a copy editor at a financial newswire and has included editorial positions at The New York Times Magazine, Facts on File, and Oregon State University.
-
Magazine solutions - June 27, 2025
Puzzles and Quizzes Issue - June 27, 2025
-
Magazine printables - June 27, 2025
Puzzles and Quizzes Issue - June 27, 2025
-
Army commissions tech execs as officer recruits
IN THE SPOTLIGHT Some of the tech industry's most powerful players are answering the call of Uncle Sam
-
Dehorning rhinos sharply cuts poaching, study finds
Speed Read The painless procedure may be an effective way to reduce the widespread poaching of rhinoceroses
-
Breakthrough gene-editing treatment saves baby
speed read KJ Muldoon was healed from a rare genetic condition
-
Sea lion proves animals can keep a beat
speed read A sea lion named Ronan beat a group of college students in a rhythmic dance-off, says new study
-
Humans heal much slower than other mammals
Speed Read Slower healing may have been an evolutionary trade-off when we shed fur for sweat glands
-
Novel 'bone collector' caterpillar wears its prey
Speed Read Hawaiian scientists discover a carnivorous caterpillar that decorates its shell with the body parts of dead insects
-
Scientists find hint of alien life on distant world
Speed Read NASA's James Webb Space Telescope has detected a possible signature of life on planet K2-18b
-
Katy Perry, Gayle King visit space on Bezos rocket
Speed Read Six well-known women went into lower orbit for 11 minutes
-
Scientists map miles of wiring in mouse brain
Speed Read Researchers have created the 'largest and most detailed wiring diagram of a mammalian brain to date,' said Nature