ehm folks ... the fact that the chinese ppl. inserted the pandora battery and nothing happens means NOTHING ... I think the fact that the screen turns black is pretty interesting, since then something happens ... maybe some minor changes in the code of the data which is on the pandora battery may make it possible that it works with the slim model.
And ... have u seen the pictures of this PSP slim of thos chinese people? I think it's strange tha there is no mac adress for the psp ... look at this picture where they show the PSP name and the Firmware version ... there is an entry "Mac Adress", but there's just a "-" ... very strange I think ... isn't it?
Anyway .. time will tell :)