Here is an amazing and simple way to test whether alkaline batteries are charged! If you have a device that doesn’t seem to be working and you don’t have a multi-meter or battery tester, you can check a batteries charge by doing this simple test!
The Energizer was almost fully charged reading 1.45V. The Enercell was discharged down to only .69V
Step 2: Drop it.
The ENERGIZER was lifted about 3″ above a hard surface (hard wood floors) and dropped. It made a thud sound and rested on the bottom or negative (anode) end and stayed standing. No bounce.
The ENERCELL was also lifted about 3″ above the same surface and dropped. It clearly bounces a couple of times and lands on it’s side.
The alkaline in the battery wears out from discharging, it creates a gas at the anode end which gives it buoyancy or the ability to bounce. The discharged battery needs to be at least half discharged to .75V or less.
Watch the tutorial video:
(June 10, 2015 – Instructables.com)