Forgive me in advance if I am incorrect but if my memory serves me, one important part of the above mentioned charging method calls for the part where turning the phone back on to be done while still connected to the charger. And allowing to the phone to fully boot before unplugging it.
Thanks bruben7886 for PM'ing me about this question. So sorry I am just seeing it now and responding.
This concept of letting the phone boot before disconnecting from the wall power adapter after charging with power off to 100%, to assure it boots and sets the FULL flag with 100% of the charge would make sense if the adapter and charging system were a constant-on charging system. However, with Lithium Ion batteries, once the battery has reached the manufacturer's recommended full charge voltage and current draw, the charging system (which is actually located in the phone itself), shuts down and supplies 0 voltage to the phone. This is done to protect the battery from possible over-charge since these batteries can not withstand a constant charge and have the potential to reach a "thermal runaway" state where they rupture and burst into flame if left on constant charge.
You can confirm whether the battery and phone is receiving power from the wall adapter and charger in two ways. First if the battery icon in the right corner at the top of the screen has a lightning bolt on it - it's receiving power, and of course no lightning bolt, no external power (even if still connected to the wall adapter). Second, if the charging circuit has shut down power to the phone and battery, the phone actually tells you on the screen that the battery is fully charged and to disconnect the charger from the phone and wall to conserve power. This is because even while the wall adapter is not supplying power to the phone, the phone still knows it's connected, and these wall adapters do continue to consume power and waste it while plugged into the wall outlets whether actually charging or not, even if there is no phone connected.
This means even if using the phone while connected but after being fully charged, the phone will run off the battery only - until the battery levels reach 90%, which is the point at which the charging circuitry decides it's time to resume and "top-off" the battery. This same monitoring and resumption of charging process happens when the phone is powered off or when powered on but in a rest state such as overnight. If you watch a phone's voltages after the charging cycle stops, you'll see that the charging system is waiting and watching the voltage, and it will drop very slowly over time. If powered off, it could take 24 hours to reach 90% due to normal battery self-discharge, whereas if the phone is powered on and in a rest state like while charging overnight, it could happen much sooner and may actually execute a resume charge during the night depending on how much power the phone uses during that time. Each time the remaining power hits 90%, the charging will resume to 100%, the charging will stop, and the waiting resumes.
The same holds true with a phone that's only partially charged but running while on the charger, except in reverse. It will run on the combination of the battery and charger, consuming power while the battery is fighting for additional power to charge. If it is able to both charge and power - depending on how much power the phone is actually using, again once the battery reaches 100%, the charging circuitry will shut down and the phone will run on the battery until it's eaten up the top 10%, at which time charging (and power) will resume. Some have experienced where the phone will actually discharge while still on charge if using GPS Navigation in the car with the display on bright (as it would be in sunlight if set to auto brightness), for instance. The reason being since it consumes more power in that operating state to run the GPS, communicate with the towers for map information, calculate and monitor routes, and provide voice prompting and display the map information than the charger can actually supply, thus leaving the remaining shortfall to the responsibility of the battery.
So knowing this, it appears that there would be no benefit to powering up before disconnecting after a full charge to 100% with power off, hoping to give the meter the best representation of 100% of capacity. The truest representation of 100% of capacity will be at the moment when the phone reaches 100% and signals the charging circuitry to shut down. If the phone is on, there can be a notification sound set to alert you that the phone has reached a full charge, though I don't believe that works with the power off (yet I may be mistaken).
In fact, the manufacturer actually shows in the user's manual, that you should charge to 100% with power off before doing the initial activation - 3 hours for the RAZR, and 5.5 hours for the MAXX. Then it says to remove from the charging adapter, and then power the phone up. If it were detrimental to the "FULL" flag to do that I am sure the manufacturer would be specific in saying to power the phone up first, before removing from the charging adapter.
Sent from my DROID RAZR using Tapatalk 2
