Sonicare brush doesn't work even though lights are on.
Is there an inside battery that I might have to replace even though it is always plugged in?
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Yes - Inside the sealed case is a glued & soldered & welded you-can't-get-me-out Li-on battery.
How old is it ? Mine is old and has become "brush-as-fast-as-you-can".
If you can get it apart, yes, you could replace the battery. However, most of them wear out & leak where the gear shaft meets the brush. If yours is the charge-by-wire type, I advise users to store it BRUSH DOWN, to avoid leakage. If it is the charging-stand type, always give it a vigorous shaking after each use.
I'd wait for Santa to bring a new one ;>)
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