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I believe (someone tell me if I am right or wrong) a top-up charge counts essentially as a partial charge. My understanding is the batteries are rated to withstand approximately (figure not correct just an example) 300 charge/discharge cycles. So if your battery is at 50% and you transfer some books and the battery charges to 75% that equates to 25% of a charge cycle.
There are pics of the Kobo break down, shouldn't be too hard to find a replacement battery for (most of those batteries have a model number on them).
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