Micro Computer
Machines Inc. Although the years referenced between 3
different sites I've read about say it was out in 1972, 73 (wikipedia),
and 74 (old-computers) but argument sake aside. Apparently it had a 1
line display, programmed APL, and per the articles actually did have an
option for battery power.
No, it had a battery backup for your data -- not a battery for actually
running the computer.
There's an excellent history book about MCM by Z. Stachniak. I recommend
it. Zig runs a computer museum at York U. and has access to several MCM
computers:
http://www.cse.yorku.ca/~zbigniew/
Nevermind laptops; a whole * other * debate is whether the MCM was the
first microcomputer! (Before any puts in two cents, please consider
READING real sources, not just Wikipedia...)
http://www.cse.yorku.ca/museum/collections/MCM/MCM.htm