I had the same problem. I changed the battery to my 350 and the company I bought it from said to let it discharge completely then let it recharge for like 10-12 hours or so a few times.
I've done this a few times and my battery is now lasting 5-6 days with a lot of reading.
With the original lasting maybe 2 days.
I'm hoping it gets better the more I do this.
Good luck with yours this is a great reader.
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