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Personally I think the whole 80% charge is really because of how a LiOn battery works, it needs special circuitry to keep track of how much charge it is holding and sometimes that mechanism can get out of whack. Although in theory it is not good to discharge a LiOn battery fully it is the only sure way to recalibrate the charge-circuitry and with the new 1.5FW there was also an upgrade of that battery circuitry firmware from what I understand.
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