My 445nm rifle will not lase at all off a single 18650. The diode's have a Vf (minimum voltage) that is higher than 4.2V, so even a perfectly charged single battery won't make any light at all.
Hmm, that is interesting. I don't have any stock model Rifle lasers on hand anymore, but the two I tested out, both did work off of one 18650 battery.
The first was the very first version that they released, that ran off of one 18650 and in reality only did 700-800mW. It was originally sold as a 1W but after the reviews on the forum it was relabeled and discounted.
The second version was rated at 1W, and ran off of two 16340 batteries. When tested with two AW IMR 16340 it hit right over 1W and was stable for over a minute.
It did also run off of one 18650, but I was only getting about ~100-150mW.
Of course since then that host was gutted... laz
eerer made me a very nice larger heatsink and the laser now does 2.3W (the lens and driver were also swapped out
). I still have the original diode in the stock tiny brass heatsink.
I haven't tested any of the new Rifle V2 445nm lasers, or the 405nm version, but ultimately it all comes down to the driver being used. A 405nm diode will certainly lase off of one 3.7v battery... depending on which driver is used.