I think the issue may be the Jetbook not reading the power remaining correctly for rechargeable battery's. However I am not near the tech expert that some here are.
But I am pretty sure rechargeable's tend to drop voltage faster, might not even start as high. Like 1.2 v vs 1.6 for alkaline's.
So the Jetbook may be incorrectly reading them.
In any case, I think long term you'd be happier recharging them more often than locking up the Jetbook. Even if you do suffer some slight long term difference because of charging them early.
However if I'm wrong I'm sure someone will correct me.
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