I took a look around and a lot of comments mentioned to get one that uses ‘LiFePO4 Batteries’, and that seemed like a reasonable requirement.
They’re supposed to have a longer life span, be safer, light weight, and better charge/discharge efficiency which is in line with what I’d be looking for.
Some brands/models that I saw recommended:
BLUETTIcame up in more recent postsEcoflow(specifically theRIVER 2) came up a lotAnkerwas suggested a few times, but the comments weren’t that detailed
edit, added an image of what I’m referring to
In addition to whatever power bank(s) you end up buying, you might consider getting a portable solar charger. I’ve used mine in like 3 different power outages, either because the outages were extended or my power banks had slowly lost charge over the winter.
I got one with like four charging ports which was nice because I could charge my phone and recharge my power banks and USB lantern at the same time.
Second this. I was at camp (with my kids) this summer and able to keep my phone charged just by leaving my power bank charging at the tent while I was hiking. No more trying to find a free outlet in the dining hall, just recharge while sleeping. My power bank would have made maybe 3 days, but I was able to be gone for the whole week.
We got green bonus points at the camp inspections because I had that outside my tent as well.