The IBM PC Convertible introduced power management, including a "sleep mode" designed to help its users avoid the long floppy boot process.
The bright LCD screen offered an amazing 640x200 resolution that was fine for text, but squashed pictures terribly. The 4.77 MHz processor was the weak point of this portable computer, and the reason why it failed to perform well on the market.
But the amazing power management features, such as not clocking the processor when it was not in use, helped this 13 pound, $2000 computer become a model for future portable computers designed to run off of batteries.
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