The SureFire G2ZX is also another option. It has combat rings to facilitate the Rogers technique.
USB charging (i.e., lights with internal batteries) is a convenient feature, but it has its drawbacks. A light powered by CR123 cells for example, can quickly be put back into duty when its batteries run out of juice simply by replacing the drained batteries with fresh ones. Unless you are fastidious about keeping your light charged, you may find yourself in the dark with a useless paperweight at an inopportune moment. What do you then? Plug your light into the power bank in your pocket?
Secondly, rechargeable batteries diminish in their ability to hold a full charge over time. Ever notice that your smartphone dies a lot faster after you've owned it for a couple of years? The same thing happens to lights with non-replaceable batteries.
"One can lead a child to knowledge, but one cannot make him think."
- Robert Heinlein
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