The vast majority of older Kobo e-readers had an SD card that could inserted by the user and the e-reader would have additional storage to read ebooks. Starting with the Kobo Glo HD issued in 2015, ...
Could have to do with the RTC (real-time clock) which I believe is what that powers. Might do wonky things if it doesn't have a battery, or the battery is low or what not. RTC doesn't matter for a ...
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