I bought my Apple Mighty Mouse some 1.6 years ago. The pack contains two +AA Lithium 'Energizer' 1.5V batteries along with Mouse. But I placed only one battery and It ran for around 1 year. Then I replaced it with the second battery and it ran hardly 2-3 months Don't know is this problem with the battery or the mouse. Then after I replaced the second one with a new Duracell alkaline battery of 1.5 V. Same problem... it last for 2-3 months and my mouse is awaiting for new battery now. Whats the problem could be? Why is it eating so much energy after first year???