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What Willa said. 60-70% charged is probably the sweet spot for "longish" term storage (i.e. getting from factory to store to end user). Li-ion batteries like being in the mid range of charge. Kobo also want enough that it doesn't discharge to zero (as getting truly to zero, not zero according to the meter that shows on the device) and staying there is bad for the battery and fully charged is slightly less than ideal (and costs them a few more cents for electricity and time to get it there). I use a phone charger to charge mine most of the time.
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