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I didn't change the battery but I had to tighten a screw, I used this method to open it.
It will depend a bit on your model.
https://www.ifixit.com/Guide/Opening+Philips+Sonicare+without+damaging+it/160920Battery will need a bit of soldering from what I can see online.
sohi
This seems a bit of a stretch, but has anyone replaced a battery in a Philips Sonicare toothbrush?
Mine had been needing charging more frequently until this week when it just stopped doing so at all. The battery isn't supposed to be replaceable, but the chance to revive it for a tenner is more appealing than buying a new toothbrush and the unnecessary crap that will come with it.