I will be watching this with interest. I bought dh a weatherproof pure oasis for christmas to use in the bathroom. It was great at first but didn't recharge after the first use so we returned it and it's now discontinued. I haven't been able to find anything similar so he's still a Christmas pressie short .
We've got a Roberts Solar DAB Freeplay (not sure about the actual model name but that's what's written on the front!) Basically it's got a charger so you charge up the battery via the mains then it lasts for ages, especially for bathroom use, and it's also got a solar panel on the top so absorbs some energy that way. I love it. Got it from John Lewis and it was about £70 I think