I have a Phantom 4 Pro Plus. It has the built in screen on the controller, I don't use a cell phone or ipad. But, battery run time seems limited on those controllers. Sometimes less than 2 battery flights on the drone, then "Low battery" warning on the controller, even when starting out with a full charge. Clarifying that it IS the controller battery I'm talking about.

Why doesn't someone make a battery pack that plugs into the controller to extend your controller battery time, like those battery packs they have for cell phones? It would have to be the correct output voltage however.

Anyone know of such a device? I've googled and they always lead back to a-c plug-in chargers, or cigarette lighter plug ins and a transformer box, like this.....

https://smile.amazon.com/dp/B086PPK42X?tag=amz-mkt-chr-us-20&ascsubtag=1ba00-01000-a0047-win10-other-smile-us000-pcomp-feature-scomp-wm-5&ref=aa_scomp_sosp1