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I have similar problems with my 5mW when it is cold. When I turn it on initially, it can be quite hard to see but after 20 seconds or so it suddenly gets a lot brighter. I think after this time the laser has warmed up and the light output increases to the specified level. I haven't actually tried new batteries to fix this problem though, I just put up with it. As I only normally use the laser to initially align the goto with 3 stars it is a fairly minor problem. I just bought a 30 from Sirius for pointing out things to people and they recommended getting a couple of Lithium AAAs. Remains to be seen if the 30 has warmup problems or if the Lithium batteries are affected by the cold, hopefully they work well as they cost $11 for the pair!
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