Gotcha. I thought it was an issue around use.I'm fine with a USB charging battery. That's how I run my E15 using Fenix batteries. Tail clicks turn on accidentally in pockets and run flat. I actively want limiting. On and off, bright & dim. No strobes, no moonlight mode, no limited turbo, no red blue flashing. Just a good, simple, functional torch that doesn't drag coins out of my pocket or turn on inside it