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The run down rule is not just required by the Jetbook. It is a rule for all rechargable batteries. If you charge your cell phone every day you will notice that the charge just does not last all day just about when your phone is two years old ?
That is why most rechargable unit warranties are two years or less.
365 days x 2 = 730 days
If you miss 10 to 15% of the days you get a 2 year warranty.
If you wanted your Jetbook with rechargable batteries to last more than two years
and charged it once every three days.
365 days / year
121 charges / year based on one every three days
500 / 121 charges = 4 to 5 years with no problems.
Also some batteries depending on the ones used in particular rechargable items have a problem with "glazing". That means if you only drain 20% of the charge and continually recharge the system from 80% back to 100% the battery, after a period of time they will not supply power down past 80%.
This is not just on the Jetbook but all battery operated devices
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