I have one of these:

https://www.johnlewis.com/john-lewis...radio/p1809416

It has a rechargable battery that I think has failed. It is supposedly
waterproof so there is no obvious way to take it apart although there
are a couple of recesses on the bottom edge that look like the might
take a small screwdriver to release a clip.

Does anyone have any experience of this model and found a way of getting
to the battery?