Here’s an interesting idea:
The potential weak spot is the availability (or otherwise) of the sales network. If they do not establish that quickly enough, to the right size, and maintain it, it will be difficult to survive. However, if it becomes as common as (for example) boxes of matches available at kiosks, it might stand a chance. I do wonder, though, if the biggest obstacle might be that those with phones that are prone to running out of power, will either already carry a backup battery or reserve, or know every charging point within their reach.
Nevertheless, a clever idea, enhanced by its environmentally friendly setup. Good luck to Mobeego.