Well, that may be true. I wonder what the alkaline cell voltage drops to when under load. Do you have any idea what the mah of a good alkaline cell is?
As long as the alkaline voltage does not drop too much under load, I feel it would put out more power ...maybe for not as long though as hi mah rechargables.
Example....if I connected a 12 volt bulb to a large car battery that was run down to 11 volts, it would be dimmer than the same bulb connected to a much smaller battery with less ah capacity running at a full 12 volts as long as the load was not so great that it pulled the voltage down