At the very least, it seems like there might be some prospect of combining the battery and voltage upticking tech here with the likes of the solar-powered Zephyr [1] which can fly at about 20km, which is apparently about the denser part of the ozone layer [2]
I suppose it would make more sense to pair the battery and voltage conversion tech with a high altitude balloon covered in thin film PV, so there's less competition between 'ozone generation' and the 'lift generation'.
[1] https://en.wikipedia.org/wiki/Qinetiq_Zephyr [2] https://en.wikipedia.org/wiki/Ozone_layer , in particular: https://upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Oz...
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I suppose it would make more sense to pair the battery and voltage conversion tech with a high altitude balloon covered in thin film PV, so there's less competition between 'ozone generation' and the 'lift generation'.