Poke 3

I have a Poke 3 from a few years ago. It's not that old. It works beautifully, however the battery seems to be weak. It only runs for a few hours until it wears down and needs a new charge or two in the same day. The battery life was never great, even when new, but it's in a bad state now.

I don't want to throw it away because other than the battery, it works great.

Any suggestions what to do with it? Is it sell-able? Seems a waste if I can't do anything with it.