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Helpful answers
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Feb 5, 2015 1:05 PM in response to joanfromcambridgeby Drew Reece,Apple Wireless Keyboard, Mouse, and Trackpad: How to install batteries - Apple Support
Or see the manual.
http://manuals.info.apple.com/MANUALS/1000/MA1544/en_US/Magic_Trackpad_UG.pdf
Are the old batteries dirty?
Do they have residue from leakage? That can stop the contacts working.