“how do I know when to change the batare canit be changed to mutch”

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• I don't believe there is a battery in this unit.

  Answered by AmberRose 3 years ago

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• Hello! The Philips Sonicare - ProtectiveClean 4100 Toothbrush is not replaceable.

  Answered by Answered by Philips 3 years ago

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