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Something to note, come next winter. My understanding is that green lasers have a lower working temperature (I see some 30mW+ ones advertised as 15 deg C minimum operating temperature). On a cold night, your light output may drop away. Though it may be the batteries, it's more likely too cold for the laser to operate. I keep mine in my top pocket between uses. Yes, true that is not much help if you have it accurately lined up in a mount - taking it out may lose your alignment.
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