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  1. C

    How do I fix this??

    I have a green laser that is <250mW. The back has a little key on it that allows u to screw the back off and change batteries. So i screwed the back off and then back on and it wouldnt work. At first i thought it was a bad size 18650 3.7 V li-ion battery but i got a new one and it still wont...




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