I just remplaced the battery of this John Lewis spectrum radio. Following advise on removing the side screws holding the antenna, I needed to lift the edges a bit to move the inner unit out.
The battery was under a black plate and had some black foam over it. mine had swollen, looked like a little bag.
I purchased one of 2000mah lithium polymer battery (the original is 2100,) at cool components. I was surprised how thin it was compared to my swollen one. IMPORTANT: I had to swap to polarity of the battery! Its a bit fiddly but you can pry out the metal pins from the connector and swap them. Alternatively cut the cable and reconnect crosswise. All works perfect,

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