This summer with me I'll be camping for 3 nights/2 days with my g/f and have no clue what I'll be taking since there will be no outlet around. I think before the trip I'll have to stock up on kgo's for charging via USB after mod batteries die off.
Should be an interesting trip and know I'll over do it lol.
A couple sets of 18650 batteries will cover your weekend camping trip easily. No stress factor. Batteries are cheap, as long as you're running 18650 mods.