I'm having the same problem. My Nikon Laser440 works sometimes under 20yds., never beyond 20yds. anymore. It shows a full battery and is only 3 yrs. old and lightly used.
I just got mine to work. It was doing the same thing. I guess I re-set it. I figured there had to be some way to re-set it. So I pushed the mode button and the power button simultaneously for 30 second. Then it worked! Wooptidoo :)
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