[ot] [sdiy] Battery questions

[Robotboy8 at aol.com]

Two questions.  Firstly, how long can I expect two AA batteries to last when 
connected to a single LED (no other circuitry)?  And will the color of the LED 
matter?  Secondly, what the heck is a UM-2 battery?  I have an old tape 
recorder that calls for four um-2's, they seem to be the same size as "C" cells, 
are they the same thing?

       -eric
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