If you have a laser that operates at 3V, DO NOT put 9.0V into it! I am absolutely certain it will fry. Can you post pictures? If you can get another battery/set of batteries that has the same voltage, it should work. I once used a CR2 and AA battery taped together in place of an 18650, and it worked pretty well.
well my man my laser wont do it i did put the batterys together not wired and it doesnt work so ya
edit also i know the laser works the old 2 batterys work but there dieing out also i cant find the batterys and there like 20 dollars for 2 at the stores
Try rechargeable CR2's from DX or ebay. You should be able to get a charger and batteries for less than $20.00. I use rechargeables in my red dilda and they work fine.
Did you even listen to what I told you? 3 batteries = 9 volts. 9 volts will kill your laser! If you want to increase the power and still have a chance of a working laser, get a 3.6 volt RCR battery. Any more than that is too much.
Sorry, but where did you get those batteries, and why are you using them? The standard CR2 voltage is 3.0 volts, as are the ones that come with the laser: