Sorry for being a noob, but I'm guessing you would load the battery with a fixed current draw and measure voltage vs time. If we say something has 1000mAh and load it at 1A, it would take an hour to drain? Is this until it gets to 0v? or is it like flashlights where we measure until 50%? Additionally, has anyone actually tested and published actual capacity of popular flashlight cells? I've seen runtime charts for various cells but not actually expressed in mAh.