sorry for my poor english, I am from Russia.
I am using battery EBL-08 (from Zaurus SL-C860), with my SL-5500.
It works fine, but I can't find any cover, to close it, and battery works without cover.
What do you think about that?
950mAh standart battery ~ 6th hours mp3 and about 2 hours with full backlite. (4hours minimal backlite)
1700mAh from SL-C760/860 ~ more than 10 hours, and ~ 4hours with full backlite.
I'll be glad to find cover, and my SL-5500 will be fine replace of SL-5600...
But my dream is SL-6000...