So far, it has been impractical, but one company, Eneco, claims to have solved some of the key problems and will soon be shipping a solid-state energy converter with an efficiency of 20-30%.
The idea is that one of these can be installed in a computer, which can use waste heat (that is currently just blown out the exhaust fans) to generate power that can be used by the computer itself.
Clearly, this can't be a perpetual motion (that's impossible), but if it can reduce power consumption (and therefore battery life on laptops) by 20-30%, then this will be a very important piece of tech.
According to AppleInsider, Apple and Dell are in talks with Eneco about getting these used in their products.
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