I had the same problem with my previous phone, as soon as I got to minus -15° the battery went crazy and jumped from 75% to "discharged".
You must use the reader according to the indicated recommended temperatures, but in any case I would not try to charge it at -20. Only charge the battery in your book reader at the recommended temperature.
Last edited by Michal Jancik; 01-09-2024 at 09:58 AM.
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