Instrument is a Geonics EM16 VLF receiver, using in the mineral exploration industry to find buried linear conductors.
this post was submitted on 16 Oct 2024
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~~Fun Fact: batteries only do this when they're over-discharged. If you design your circuit right, this won't happen.~~
These batteries are in a circuit which has a physical power switch separating it from the device, meaning there should be zero parasitic drain while off.
Thus I conclude your fun fact to be apocryphal.
Guess the Duracell rep lied to us. Sorry.
Duracell rep might be a sales robot. Or possibly talking about another type of battery? Anyway, points for learning :)