Did you know that some CPU coolers in computers already use a primitive thermopower generator? Yes, indeed, thermoelectric CPU coolers use some of the waste heat generated by the computer to cool the machine. Of course, traditional thermoelectric generators are quite inefficient compared to thermopwer generators, but the principle remains the same.
In the near future, with a thermopower generator installed in your computer, you won't need to be limited by battery power for your laptop computer. The heat from the air will be converted to electricity to power the machine. And, the heat generated by the computer will be used to help provide some of that electricity to run the machine.