Red Led
Red Led
How long does a red 10mm LED light with a cr2032 battery last?
I've heard it lasts around 37 minutes, I've also heard that it lasts for years. Very perplexing. No resistor, nothing else. A red 10mm led light with cr2032 battery.
Thanks! 
If you connect a battery directly to a LED without a current limiting resistor, the current can be anything over a large range, depending on the LED characteristics. And those can vary widely from unit to unit and over temperature.
So, yes, it can last only a few minutes, or many hours.
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