Seriously folks, I’m staring at a 20+ year old battery that still shows full capacity according to my voltmeter.
The battery in question is a tiny BR2032 – which is strange, considering most go by the name “CR2032” – maybe because this one has solder tabs attached to it, making it board mounted? Anyway, it’s a BR2032 battery attached to a Panasonic T33 electronic typewriter that’s totally circa 1980.
This battery seems to be a battery backup for the logic board’s text memory, before there was Flash ROM (e.g. Nintendo battery-backed cartridges). What I really don’t understand is why it’s still showing a charge after 20-plus years. It’s a one-way battery! It discharges. It’s not rechargeable and there is no charging circuitry on the board. But that’s the only way I could explain how a 3v battery THIS OLD can still show 3.1v when hit with the voltmeter (and checked, and double checked, that it was unplugged from the wall).
Whut the crap. I have no idea what to say about this. All’s I know is, now this odd piece of curiosity is out on the internet, in a vain attempt at finding anyone else with a similar, eh, well, not really problem, but experience. May the Google gods smile on you, oh fellow searcher! 😛