Chad Varnadore
Newly Enlightened
Most of my lights are modified. However they still come in stock form. Fenix and acebeam make some lights with the proprietary battery pack. I have absolutely no interest in those. You are dependent on the manufacturer for replacement.
Many lights have this USB charging. I would never use that because it's too slow. However a lot of those lights you can use your own battery and take them out and charge them yourself.
We all have preferences. The proprietary battery pack and the USB charging are not any of my preferences.
I'm not a fan of custom batteries either. You have to weigh the desirability of whatever specific performance goal necessitates the specialized battery with replacement cost or even the potential risk of the battery being discontinued at some point. With light innovation progressing as rapidly as it is these days, there will likely be both better and cheaper alternatives by the time either consideration might be of immediate relevance. Regardless, like I said, it's not a concern of any viable relevance for any of the magnetic lights being discussed in this thread, as none require proprietary batteries to achieve peak performance, nor do they require charging inside the light through the magnetic interface. Which, btw, I haven't actually timed it, but the Klarus seems to charge just as fast magnetically as I can charge the 18650 cell in an external charger at 1000mah charging.
As for usb interfaces, I don't like them nearly as much as magnetic usb interfaces. For one, I don't fully trust how water tight they are, especially if such is critical to how well the rubber flap is inserted. I also find the new micro usb fittings annoying that I have to put on reading glasses just to see how to properly insert them (never can tell which is up or down). I only need glasses for reading, so it's not something I always have at hand. That said, to me the appeal of usb and usb magnetic charging is it's increased versatility when away from home, especially if you have a rather large 4+cell charger you don't want to pack.