I gave this a try: It seems to be a reliable indicator when a battery is stone dead. The trick is to drop the battery vertically. Neat!
It turns out that when the alkaline in a battery wears down, it produces a gas that fills the inside. So if you’ve got a box of random batteries you want to test, and don’t have access to a voltmeter or any other device, you can simply drop them vertically a short distance onto a hard surface. A charged battery will make a solid thump sound and often remain standing, while a dead battery makes a muffled sound, bounces repeatedly, and then topples over.
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Steve Ballmer Serves Up a Fascinating Data Trove
Wearables — Chalk it up
Electronics — Look to ferrites (no, not ferrets, the European polecat) when faced with high frequency
Biohacking — A Run in the Altra IQ Smart Shoes
No comments yet.
Sorry, the comment form is closed at this time.