Those are cool. I had something similar from Black and Decker years ago. The bad thing is.........once the batteries no longer holds the charge, the whole thing is useless.
Not sure if the Jackery 500 is the same way.
I still have my B&D Storm Station. When the battery won't hold a charge anymore, I get a replacement from my local Interstate Battery location. It is the same battery used by emergency lighting fixtures. I would think that you can probably do the same thing with just about any thing that has a battery. Although some times it is cheaper and/or more practical to buy a new item.