Due to growing requests, I just put an old D.I.Y. tutorial on opening an Acer Travelmate 613 back online. The tutorial can be found here. It is written in German, but has several photos in it.

Anyway, please note before following the tutorial: I opened such a device many years ago for disconnecting the internal battery, after the notebook suddenly had a bios password enabled. While it helped resetting the bios password, it didn't solve the problem ultimately: The TM 613 had a security chipcard reader which was also randomly enabled and naturally didn't respond to the empty factory cards I had. So I ended up sending the device to the Acer people, who fixed the problem fast and for free.