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So it took me way more time than i expected but live was busy and i did not had time to read a lot. But i loaded the same 2 books on my moms and my reader, charged them both to 100% and started to read. Both reader side by side (same brightness and setup). When my reader was down to 2% my moms reader was (running FW5.8.9.2 is not giving me battery %) at ~80%.
1. Changing the battery did not have any real affect on the runtime (i gained maybe 30min because the battery from my moms reader is hardly used).
2. I removed all books from my reader and reuploaded only 2 books. But that did not help either.
3. Then i connected the reader to my PC and deleted all the files that i could delete. Then i had to punch in all my personal info again and setup the reader completly. I only uploaded a handfull of books (insted of the few hundret books i usually have on my paperwhite, charged it up to 100% and waited untill indexing was done). And that fixed it more or less.
The runtime is still a bit worse than on my moms reader running on the older FW but now i do not have to charge the reader every 4-5h.
To bad that it is not possible to go back to a older FW. But for now i am happy that i can use my reader again with reasonable runtime.
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