Re: lumia 920 Battery Issues
Please don't! Modern lithium batteries don't not like to be fully discharged
They won't fully discharge anyway, because the Software turns the phone off when it hits a certain minimum capacity.
The point is not that the battery needs it or anything, it's that the phone needs it. The battery gets charged to some point in the factory and then inserted into the phone. There it naturally discharges over time, and the phone is off and doesn't know the capacity or anything.
The point is, that the phone needs to be calibrated to the battery, not the battery itself. I've had this with my Samsung smartphone, when sometimes the 1500mAh battery would only last half as long as usual and when the phone would say 87% to be a full charge. What I did was to use it until it simply ran out of battery, then try to turn it on again, and when it turned off again, I could take out the battery for a few minutes so that the phone shuts off completely with no current to power any of the sensors, then I would insert the battery again, and then plug it in. (Some people would plug it in when the battery is out, so that the phones sensors recalibrate, don't know if that works or not and can't remember which method worked better, it's been too long, but I tried both at times).
Once I've plugged it in again with the empty battery inside, I would let it charge overnight. Sometimes I would even take out the battery after the full charge and put it back in to see if it still showed the same 100% reading or if it was less. Anyway, what I meant to say is that it isn't the batterys own fault, but the phones. The phone can think that the battery is full when it is not, or that it is empty when it is not.
Also, disable NFC, the same way you (should) have bluetooth or wifi disabled if you don't use it. They are all antennas and they all use power when turned on. Anyone who got one of the normal phones with bluetooth and/or wifi between 2004 and 2008 will have learned this, as it could have reduced the battery life of your phone with its 700-950 mAh battery to 2-3 hours if you forgot to turn it off, or if you didn't know you had to in the first days when you first got it.