I recently purchased a 1700mw blue laser that says it runs between 6-9 volts, so 2 18650 battery's equate to 7.4 volts which would work but i was wondering what would happen if i used only 1 18650 battery that is 3.7 volts would my laser power up and run at a lower Milliwatt or will it ruin my laser module,
Thank you