[DaveNetMan]

Ok, that does make sense. The battery that came with the player was totally, completely wrapped in a black rubbery film, almost like electrical tape. I can see absolutely no vent holes whatsoever. (There is also no writing of any kind). The good news is, no leaks that I can see, and the rest of the player looks intact. So let's hope my replacement battery is better!

Thanks again, great info!