I think the “it retains 98% charge” quote might be misleading. Thats true for the capacity (in Ah), but not for the energy (in Wh). The report shows this clearly in the tables:

Efficiency is about 83% if my math is right (which is still good).

The report is from an independant institute from Finland, not Poland:

VTT Technical Research Centre of Finland Ltd

The play store description says it’s an app for multi factor authentication for various EU services. The reviews are pretty desastrous though.

I’d prefer it if inexperienced people did not attempt to climb the Großglockner - Austria’s highest peak - in winter, especially with non-alpinists.

If you do find yourself in this situation, please call for help and stay on the line until rescuers arrive.