>My first reaction was to use solar cells, but that could require wires. 
>Can the solar cells be attached directly to the LEDs in ice, and still 
>generate the tiny bit of power for the LED? It's worth trying. Won't it 
>need resistors?

Not if the internal resistance of the battery is sufficient to limit the 
current. The resistor is only needed if you need to limit the current 
flow. 


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