i recently bought a 150mw 405nm laser that has adjustable focus that arrived today, and it got hot enough to melt plastic, light matches, pop balloons, etc. but after about a bit of fooling around the power of the laser seemed to drop drastically, and fast. i recharged the lithium ion battery (18650, 3000ma, 3.7v). i checked with a multimeter and it was actually over volting a little over 4v. anyway i put the batertery back in the laser and the power output has changed any ideas?