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Originally Posted by dette
I dont know if that is correct... I know if you do that to where your battery is all the way dead meaning it wont even turn back on then it hurts the battery...
have you tried this?
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There is a difference between discharging a Li-ion battery and letting it discharge to the point that the phone turns off. The charging circuit inside the phone estimates how much battery power is left by measuring the time it takes to charge and build an average for that device. If the charging circuit gets reset at night a few hours before you set the phone to recharge (as it would if you flashed the new ROM after work) then the circuit believes that the battery took a full charge in very little time.
As someone said Li-ion or Li-poly cells do not get a memory, and they do not need to be periodically fully discharged to reduce the risk of a momory, in fact it is a bad idea to fully discharge a Li-ion or Li-poly cell because it will not be able to work again.
However the device has a circuit that controls charging, and will not let the cell be discharged lower than say 3V. SO when you see a battery is empty, it is actually only aproaching 3V for example. And then the phone turns off.
By letting the phone run down several times in a row, you teach the charging circuit the actuall remaining capacity of the battery so that it can estimate the actual battery life.