Hi all, I'm looking over buying a new portable battery to charge stuff with. I'm looking for a decent make that has the highest possible energy density whilst also still being portable. I currently have a slim Ravpower thing that supplies 20000 mAh (and has a surprisingly handy LED light too) but I think it's starting to lose lifespan. I'm currently considering a Charmast 26800 mAh thing but it doesn't have an LED. Anyone have any thoughts?