Do either the Walkman s610 or a810 feature a user-replaceable battery?

Question

If they don't can anyone recommend some that have one or point me to some sort of list?

Answer 1

I have yet to find any device like this that has an easily replaceable battery.  If you get an iPod, you can send it back to Apple to get the battery replaced, but that costs something like $80.00.  These devices have pretty good rechargeable batteries, so replacing them is not really a major issue.