These seem to be a combination of capacitor and battery - not pure capacitors. So I think they will have some downsides of batteries like a more limited cycle l

These seem to be a combination of capacitor and battery - not pure capacitors. So I think they will have some downsides of batteries like a more limited cycle life than a pure supercapacitor. The article doesn't seem to touch on the downsides which is common with this kind of reporting.