I’ve had a number over the years; the Anker ones seem to be pretty good quality, but anything that has good reviews on the big river site will probably be fine.
If it were me, I would save the power bank capacity for cell phone charging, and consider one or more of the following options for light:
- 30-day or 60-day (or equivalent) lanterns - These are fairly large and heavy, generally running on 3-6+ D batteries. But, as the names imply, they have extremely long run times, and are just the thing to set on a table or hang from the ceiling.
- good quality single AA flashlight - Something like a Fenix E12 V2 boasts 70 hours of runtime on low. It’s small enough that carrying it around in your pocket is easy. Even allowing for some exaggeration by the manufacturer, one of these paired with a large (e.g. 32 or 48 count) pack of AA batteries should provide thousands of hours of light.