I just heard back from iBasso.  They sell the battery for $8 plus $5 airmail shipping.  I've ordered one.

Quote: Great link, thanks a lot.  It's just that all these batteries (OK, so I haven't clicked through to ALL of them) seem to be 3.7V rather than 4.2V.  That is quite a difference so I'm just not convinced it would work.   In fact, when I started looking for batteries I found loads of...

I have tried to search for other posts on this but not found any.   I have had a D2-Boa since early 2009. It only sees occasional use, either on the go or next to my laptop.   Suddenly the other day when I took it out to use it, it wouldn't switch on.  I was surprised since this has...