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2012-08-19 04:43 PM
The charge is returning to a higher value after a high load, it's the approximation of the software which tries to measure the correct charge of the battery . If i'm reading the graph correctly , the spikes are immediately after you stop doing any activity, or after you play a movie/ game , browse the net or other activity witch drains the battery very fast. I belive that the software tries to approximate the rate at witch the battery discharges based upon the current drain, but if you stop immediately , the software tries to calibrate the readings and finds out that there is more charge than the previous calculations.
This could explain why you see those spikes because the measurement cannot be very accurate all the time : http://batteryuniversity.com/learn/article/calculating_the_battery_runtime
2012-08-20 01:44 PM
Actually the software of Xperia is something liken this.Its not a fault of the Phone or battery.Its a small coding bug may be.Pecause the battery is Lithium Polymer and such shouldnt happen.I have never seen iPhone like this though even though how intesively you use it