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Unclip the razor head.
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Unclip the black cover, using a slim tool like an iSesamo or with some guitar picks. Insert the tool alongside the gap between the two pieces.
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Remove the black back cover
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Unclip the keypad from the bottom.
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Unclip 8 grey clips (4+4 right and left).
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Unclip the eight clear hooks from the hermetic waterproof cover (4+4 right and left).
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Lift up the logic board.
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Optionally you can desolder the solder joints circled in Red to separate the logic board from the motor, by doing so you can work in a more comfortable way while replacing the batteries
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I bought single battery and I soldered them in the same position as the previous pack.
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