I have 2 AAA Energizer Max Alkaline batteries, in series, powering a 2.5V 25mA 10mm LED with a 22ohm resistor in front of the LED. The spec sheet on Energizer's web site led me to believe that I should expect about 1300mAh capacity with a constant 25mA load giving me about 52 hours of constant use. My question is, "Why is the LED still bright as ever after 72 hours?" If anything, I'd have expected the spec sheet to over estimate what I would really see in my application. I'm sure I'm missing something obvious, but could somebody please shed some light on this for me? Thanks very much.