I was going through some of my older flashlight junk when I came across an old surefire G2 incandescent with the upgraded bulb assembly even and an innova.I was just going to chuck them in the trash but I figured why not try to at least get them working & try to upgrade them if possible.For starters I want to do away with the cr123 batteries I bought a set of 4 sanyo 16650 batteries $20 .Then I purchased an LED upgrade for surefire G2 allegedly 650 lumen $5.56 Surefire Flashlight Bulb LED Conversion Upgrade 650+ Lumens Cree XML T6 Single Mode Drop-in P60 Design.The G2 was easy to replace the bulb assembly & a 16650 battery.It works prefectly.The innova I was unwilling to take apart further than replacing the cr123 batteries with a 16650.I did not notice that the 16650 batteries I ordered where flat top (which was not an issue in the G2) so I had to okie rig a thin conductive washer to contact the + side of the 16650 in the innova. Both now work and are using rechargable cells. I have not had any issues with either.So far so good.