Magic Mouse Batteries drain in 2 days

Hello folks,
I own a Mid 2011 iMac since Feb 2012. The Magic Mouse that comes shipped with it never gave me problems until up to a few weeks ago, where it drains my batteries literally in one or two days! At first I thought it was some faulty batteries, but now I already had about 6 replacements hoping it will be okay. Yesterday I bought new batteries, and today the level is at 38% - how do I troubleshoot it?
(I do not use rechargeable batteries. Lithium and Alkaline only)

Magic Mice can die.  Mine, from the same iMac model as yours just went belly up a couple months ago. It as also using up batteries pretty quick but not as fast as yours.  Even the Genius Bar veterinarian couldn't revive it. As Forrest Gump once said:  "It happens". 
The replacement with regular batteries is getting about 13 weeks between batteries at about 8 hrs per day (turn it off at night).
Just give it a decent burial. 

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