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Just to add my experience, I've also had the KA1 since the first day I could buy it locally, so around 3.5 years. Battery is comparable to what it was when I bought it. As someone else said, it was never brilliant (at least compared to my original Touch) but it's not significantly worse. I've been using KOReader pretty much exclusively for the last year and with an average of an hour of reading a day I probably get a couple of weeks between charges. I usually charge when my battery gets below 20% but I've also found that I can keep reading with the battery at 0% for quite a long time, so maybe that's something worth considering - whether or not your reader is telling you lies regarding the battery percentage. I haven't been able to find anything definitive about battery calibration with Kobos but maybe this is something worth investigating.
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