Philips SONICARE E5000 User Manual page 11

 Insert a screwdriver into one of the slots that are located near the
top part of the handle. Push the screwdriver blade into the handle as
far as it goes and twist the blade. The housing begins to split.
3 Remove the screwdriver and apply the above instruction to the
other slot, which is located on the opposite side of the handle. Twist
the blade to split the rest of the housing.
4 Now insert the screwdriver into the middle slot, which is located on
the top front part of the handle, as shown. Push the blade in as far as
it goes.
5 Now use the screwdriver as a lever to pry the  handle sections
apart.
6 Pull the  handle sections completely apart.
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