Powerbanks Charging LiIons Inside Flashlights?

I know this might be a simple question, but thought many of us “nontechs” should be aware of any safety or battery life issues before we just plug a powerbank into any of the “new” torches containing USB charging ports. I have several chargers, but am hesitant to feed the cells whilst they are sealed in a metal tube.

Murphy’s Law requires me to ask before throwing external power into a “pipe bomb waiting to happen.”

There shouldn’t be any difference between charging from a powerbank or any other Usb port… As long as the integrated chargin doesn’t charge past the voltage limit all is fine.

+1
The USB connector on the flashlight body will regulate how much current will be received; this is how all my USB ‘charging in’ ports are regulated on my equipment.