For full instructions to change the batteries in most wireless Apple peripherals please see http://support.apple.com/kb/ht3903
Apple Magic Mouse
Note: This mouse requires two (2) AA batteries.
To replace the batteries of an Apple wireless mouse:
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Turn over the mouse and turn it off.
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Remove the battery compartment cover and insert two AA batteries. Make sure the positive and negative ends are facing the correct direction, as shown below.
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Replace the battery compartment cover.
Apple Wireless Keyboard
Note: This keyboard requires two (2) AA batteries.
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Turn the keyboard off.
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Use a coin to remove the battery compartment cover.
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Slide two AA batteries into the battery compartment. Make sure the positive ends are pointing the correct direction.
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Replace the battery compartment cover.
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Turn on the keyboard.