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You can probably find instructions on youtube
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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.
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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
Grrr. This actually bugs the shit out of me. Loads of devices out there where the battery dies way before the device does and you end up having to throw the whole thing away. Bike lights, I’m looking at you too.
If it helps anyone for the future, the kids versions of these toothbrushes take two AA batteries, seem to work the same and take the same heads as the adult ones. Use your rechargeable AAs, you don’t need another charger plugged in somewhere and never worry again about an internal battery failing.
I think the sad reality is 99% of people don’t use rechargeables and environmentally it probably works out better to dispose of the device than it does to deal with the mountain of cheap pound shop batteries people would otherwise use.
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Yes. A long time ago though. It was not difficult and it worked fine again, but I was always slightly concerned about whether it was waterproof.
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@Brun
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.