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Key battery losing power/dead? (Black fat key, not silver triangle key)
The replacements are very cheap (I found an 8-pack on ebay for $4.00 shipped) -- CR1220 Lithium Battery.
Just use a knife to pop open the back of the batter (there's a rectangle with a little spot where you can put the knife to pop it off). Unscrew the two phillips screws (need a pretty small screw driver), and just replace the battery. Make sure you put it in right side up 
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