Philips Sonicare DiamondClean 9000 Manual page 25

4 Remove the end cap from the toothbrush handle. If the end cap does not
release easily from the housing, repeat step 3 until the end cap is released.
5 Holding the handle upside down, press the shaft down on a hard surface. If
the internal components do not easily release from the housing, repeat
step 3 until the internal components are released.
6 Wedge the screwdriver between the battery and the black frame at the
bottom of the internal components. Then pry the screwdriver away from
the battery to break the bottom of the black frame.
7 Insert the screwdriver between the bottom of the battery and the black
frame to break the metal tab connecting the battery to the green printed
circuit board. This will release the bottom end of the battery from the
frame.
8 Grab the battery and pull it away from the internal components to break
the second metal battery tab.
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