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you mean a small led like a LED mouse? I know of mini-notebooks that use this principle; but I think it uses quite an amount of battery too...
For that you'd almost need to equip the device with a second battery.
If sony made the space inside the guts of the machine, a second battery could cost you upto $20 max, and the additional wheight too.
I wouldn't mind my reader being a bit more heavy having 2 batteries inside.
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