Microsoft veteran Raymond Chen has been known for his strange but interesting posts on his blog. Today, he has released a post explaining why it is that your mouse works just fine with only one battery.
According to Raymond Chen the mice were designed to accept two batteries but also to only function when one is added. The reason for this is quite simple by allowing a second battery they can say that the mouse will run twice as long between battery changes.
“Yes, the mouse works just fine on only one battery. The reason why the mouse accepts two batteries is to double the amount of time between battery changes! This allows the text on the box to say “Runs for N months without needing to change batteries” for a value of N that is twice as high as it would have been if the battery compartment accepted only one battery. This is the electronics equivalent of installing a larger gas tank in a car so you can advertise it as “Travels ⟨distance⟩ on a single tank of gas.”
This is an interesting idea the best part though is that its such a simple concept and yet it greatly influences consumer spending.