Quote:
Originally Posted by alanworland
In 1982 I made a fuse tester using a small buzzer powered by a Duracell PP3 which I sealed in a transparent case.
Still works well although I can see a bit of 'fur' developing around one of the terminals but it is 31 years old! Alan
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I was always taught that batteries leak once they are discharged (this may well be a 'factoid' from the days of zinc-carbon cells in bike-lamps etc where the zinc outer casing was actively consumed during the electricity-generating process.).
It could be that your PP3 has seen little if any actual discharge so the leak-initiating chemistry hasn't yet happened very much. I've had PP3s in things like clocks and smoke-alarms start oozing after a couple of years even though their "use-by" date is still some time away.