A do-it-yourselfer took out the LED from the new Mighty Mouse to see how much power it could save. After syncing, the mouse seems to use less power when the mouse is moving. After the procedure was finished, people pointed out that the light only came on because the laser was out-of-focus, and that his procedure didn’t save quite as much power on the mouse as he had thought. It still extends the life of the battery, just not as dramatically as the 0.0450 Amps figure.”]
Source: https://gizmodo.com/hack-the-mighty-mouse-to-use-less-power-191632