The STacy was cool bit it was a bit of a brick (7kg!!), much akin to the first Macintosh Portable. The ST Book was much nicer: https://en.wikipedia.org/wiki/ST_Book . It was only 1.9kg, similar in weight to a 2010 MacBook Pro 15". Only big drawback was that it lacked a backlight which the STacy strange enough did have. The ST Book did have a fairly long battery life despite running on only 7 AA batteries!
Unfortunately not very many were made of that one. Only 1000-1200 ST Books compared to the 35000 STacys. It was produced during the downfall of Atari. So they are pretty much unobtainium these days.
The STacy has a battery compartment but in the end Atari decided not to offer a battery option because the runtime was so miserable. They improved that massively with the ST Book (but by cutting the backlight, external video interface and floppy drive among others).
Unfortunately not very many were made of that one. Only 1000-1200 ST Books compared to the 35000 STacys. It was produced during the downfall of Atari. So they are pretty much unobtainium these days.
The STacy has a battery compartment but in the end Atari decided not to offer a battery option because the runtime was so miserable. They improved that massively with the ST Book (but by cutting the backlight, external video interface and floppy drive among others).