Have not used them myself. But have watched several videos on guys who have installed and are running them. They are saying the can run all day with black box on 18 and they are running the newest 9.0 amp. Say they are getting a little clearer picture. But main advantage is weight savings verses a normal extra battery. And for guys who are buying lithium batters it’s quite a money saver especially if you happen to have a tool or 2 and extra batteries to start with. Don’t shot the messenger I’m just passing on information.