this a solution to a tnrc dilemma, waste a set of batteries with a few hours or so left in them, or hold up the whole group switching them out mid ride, peering into the tiny plastic holder trying to suss out the polarity...
but someone should invent a light you can change faster then that... http://www.youtube.com/watch?v=rQwtN-Ypdx4
@Polky started
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this a solution to a tnrc dilemma,
waste a set of batteries with a few hours or so left in them, or
hold up the whole group switching them out mid ride, peering into the tiny plastic holder trying to suss out the polarity...
but someone should invent a light you can change faster then that...
http://www.youtube.com/watch?v=rQwtN-Ypdx4