Together with a battery, such supercapacitors could run a cellphone for days. Really? That's novel. One of the proposed applications is for bursty current app

Together with a battery, such supercapacitors could run a cellphone for days. Really? That's novel. One of the proposed applications is for bursty current applications which currently have batteries with more capacity than required in order to serve peek current demands, but I rather doubt cell phones are in that category.