I use these fairy lights, which have a little rechargeable battery attached. They're crazy light, and charge via USB, so I can just recharge them with the little power bank I'm already bringing for my phone. (They could also plug into the USB port on most backpacking solar panels...) They're supposed to last for 24 hours of continuous use; I can say that I've got them on the ridgeline of my camping hammock (which I've also been using at home) and I rarely need to charge them. I cut a couple of twist ties into thirds and used the little pieces to attach the cord to my ridgeline, letting the little battery/switch box hang down to rest in my ridgeline organizer 😀 Only downside is they feel somewhat delicate, so I baby them, but they've been going strong for over a year now so... 🤷🏽‍♀️