After my Nokia Lumia Black update on my Rogers NL920 I noticed inconsistent battery readings. So far it has happened twice. I take the phone off the charger and it reads 100% playing music with my headset plugged in for 45 mins, the batter reads 20%. So I close all the apps using the app switcher. After another 1hr, the battery meter reads 7%. I decide to play a battery intensive game for a few minutes, but there is not further loss of power, only the usually warning banner that says battery low etc. I eventually head to bed forgetting to plug in my phone for a nightly recharge. The next morning my phone is still on, but when I go to check my mail, the phone automatically shuts down due to insufficient charge.
NOW the STRANGE PART - I plug my 920 unto the charger and the phone immediately reboots. The battery meter reads 85 percent. WTF.
Happened twice in the last 4 days since I installed Lumia Black