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Originally Posted by the.Mtn.Man
There is no need to "train" a rechargeable battery.
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You don't have to train the battery, but the charge control chip sometimes gets out of sync with the health of the battery. But I agree, even fixing that is rarely needed, and as I said above, doing it overly much will wear out your battery prematurely.
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This is really no longer a problem since modern electronics and even rechargeable batteries themselves have protective circuity built-in
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This is half true. *most* consumer grade rechargeable lithium based batteries have a charge control chip. But the chip is not built in so much as soldered on, and it is easy to get raw cells with no chip, even on batteries that require one to be safe, especially the cylindrical form factor cells.
But since no kobo has removable cells, that doesn't apply here, and is starting to get off topic. (And if you are replacing the battery pack in a kobo, care must be taken to make sure the new pack has a charge control chip or you keep the old one. But I don't repair devices like this, so what do I know.)
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...so it is almost impossible to damage a battery this way.
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Almost is the keyword here.
It's impossible to overcharge with a charge control chip, because the whole point of the chip is to prevent overcharging, because lithium secondary cells tend to explode when overcharged. (Lithium primary cells explode when charged multiple times, overcharged or not.)
However, while the charge control chip does try to prevent drain below 5% (which can also kill the battery), it can only reduce the chances, it can't prevent it. And it can't prevent you from cycling the battery too often either.