Why does Magic Mouse use much more battery power than the keyboard?

I have the Bluetooth versions of the keyboard and the Magic Mouse. I use the same rechargeable batteries in each. Yet the mouse has now come to the end of a THIRD set of AAs, while the keyboard still has 60% of its first set.
Why? They are both constantly in use, so why does the Mouse drain batteries so much faster than the keyboard? Viz: the mouse about once a week (two, max), while at this rate, it will be another month or more before the keyboard drains.

Actually I don't! I consider myself a 'power user' in that I will always use the keyboard first, and I learn keyboard shortcuts for nearly everything I do regularly.
I would guess my use is 50:50 at worst?

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Intel-based Macs: Resetting the System Management Controller (SMC)
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The original batteries only lasted just over 2 weeks and I was forced to replace them just a couple of days ago.
Throughout their life the mouse presented mixed signals about battery percentage, after a few days of use it suddenly reported low battery (the day before it said 100%) and then after moving the batteries around it returned functionality.
I had to repeat this "fix" untill the batteries were totally dead. earlier today I had to exchange the second pair of batteries, which had a supprisingly short battery-life.
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First, battery life is a direct function of usage and the type of batteries in use.
Throughout their life the mouse presented mixed signals about battery percentage, after a few days of use it suddenly reported low battery (the day before it said 100%) and then after moving the batteries around it returned functionality.
Inaccurate readings (in system preferences) is a known problem. I have found that a Dashboard widget (mighty monitor) is reasonably accurate.
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Why does Magic Mouse use much more battery power than the keyboard?

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