There's never an outlet around when you really need one, is there? And that's when you really need to have a portable battery pack handy. As veteran journalists who need to keep their gear ready to go and tech specialists who love electronics, we are always testing new battery packs. We checked their capacities, tested their connections, and tested their power output to find the best of the best. We also took into account special features that add meaningful value, such as stands, displays, and wireless charging.