Re: Xperia Z battery life
Battery life shouldn't get any better with some cycles when using lithium based tech (lithium ion or Li-Po).
What it will actually accomplish is a better software reading at your battery life remaining.
At first, the software will guess at its best what is you battery life level. After a full charge, it will know for as precise as it can, the 100 % mark. After a full discharge, it will know as well the 0% mark.
As for now, Android will shut down your device if the software thinks that you've reached 0% battery life while it could get a bad reading and you could still have 5 % (not likely to be wrong more than a few percent, 5 is actually huge).
I won't recommend to do that too often as a full discharge can harm lithium battery (I don't even bother to calibrate my battery as first aka doing 1 full cycle as it normally would be unnecessary).
1 full charge = effective 100% charge, if you charge 3 times you phone like this 30%, 20% then 50%, it will count as only 1 cycle.
Some manufacturers would recommend to do a full charge cycle once in a while (once per month), it's in order to redefine the max and mins marks especially if you don't use your device (not likely to be your smartphone, but could be a ipod like device) quite sure often as lithium tech based batteries have a better power consumption if continuously used.
Usually, most manufacturers would implement some safeguards to ensure that the system will never reach the actual 0% mark (not the software % that you could eventually read, not likely since it would shut down at below 1%) since it could really harm the battery (possibly deadly if reacher really low voltage per cell).
The way most moderns batteries lithium based are made, they would lose 20% of their capacity after 500 full charge cycles (~ 2 years depending on use).
Since most manufacturers implement safeguards and I'm only cautious when the battery power is very low, I don't really care about day to day use. Just charging every night because I want to have a full charged battery in the morning.
Apple guidelines regarding lithium : http://www.apple.com/batteries/
The only rule I follow : avoid depleting entirely the battery. Never got any problem if there wasn't one in the first place (defective battery that I replaced the following day).
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