UL power banks

[Colby3]

Flextail zero or nite coreNB plus? Looking at one of these two to carry in my pack archery elk hunting. If we spike camp I'll need the power bank for 3 days. Any experience with either of these?

 

[Drenalin]

I've had an NB10000 for three years or so and have never had an issue with it. Can't speak to the Flextail.