I had two extreamly cheap (but brand new) AA batteries that i wantet to test. I soldered a 5mm green led to the batteryes with resistor. The two batteries gived 3.2 volt when i started and the led current was measured to 4.96mA.
An online calculator gave batteries around 20 days lifetime.
I soldered the led to the batteries 3.august 2020 and today the led is still working. I measured the voltage today and that gave me 2.69V.
I'm a little impressed, for it is not common for things to work better in practice than in theory in my opinion.
Batteries is soldered in series.
Is there some good explanations for this?