Not sure why your battery info is resetting after a reboot. Mine keeps the time fine after .. So what you are saying is if you were charged 100 percent , disconnected the cord , and used the device for an amount of time you would see a breakdown of your usage correct? Apps , total time used on battery etc. Then after a reboot all of that info is gone? Are you sure you are doing this without connecting power at anytime in between? Not even sure if that will make a difference ..just trying to wrap my head around this one.
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