Yeah, I carry a set of extra AAA bats for a Nebo Slim flashlight I use at the campsite because, like you said, carrying a charger weighs more and takes up more space, plus a charger uses 110 volt American plug, I can't plug that into my solar charger I take to charge my phone, my small bike lights, but when I'm bike camping I don't take my AA powered Philips Saferide, I don't need it since I don't travel in the dark when bike camping. Plus most campsite stores carry AAA bats, and if not I can always find a store that will, so the extra set gives me a huge cushion of time to buy another set after the first set dies.