I had the same problem. Sent it back to them and they fixed it, but perhaps I should have a look inside. They did imply I'd dropped it when I'd done nothing of the sort.
They are actually fairly repairable once you manage to open the watertight enclosure, which requires patience and a fair bit of violence. Switching out the cell is really easy once the battery starts dying.
The different Sonicares also share many of their parts, makes replacing broken pieces possible if you ever do drop one.
The different Sonicares also share many of their parts, makes replacing broken pieces possible if you ever do drop one.