I have 2 RavPower products. A power bank and wifi hot spot and I've been impressed with both. I'm getting their 15 watt portable solar panel for Christmas. IMHO they are well built and very cost effective.
I could say the same about Anker.
I have two power banks, a Bluetooth USB keyboard, and a new solar panel from them. All seem to be excellent, and my older power bank and the keyboard have been put through serious abuse (years of being pocketed, dropped, banged around, left in cars, etc.) and still work just fine.
So I had to cruise by five below today and pick one of these up.
Do you think it is safe to charge unattended?
It's funny I think nothing if leaving a cell phone or laptop unattended while charging but wouldn't do it with 18660. Not logical but just me.+
Never once have I been concerned about charging the multitude of Li-Po & Li-Ion batteries unattended I own, in all kinds of stuff.
..including tools/electronic stuff and the like.
Am I concerned about using a Powerbank,, not at all
It's funny I think nothing if leaving a cell phone or laptop unattended while charging but wouldn't do it with 18660. Not logical but just me.