Alright, here's the story. For the past two weeks my Battery Use has been this:
Android System 96%
Cell Standby 2%
Phone Idle 2%
There has been almost no variation from that. Every now and then Display or Wi-Fi would show up as about 2% each, then disappear after a while. That's all.
Last night my battery reached 10%, I turned off the power, charged it overnight for 12 hours, unplugged it, and turned the power back on. I noticed two things:
1. My Battery Use list changed drastically. Now it shows something like:
Cell Standby 31%
Android System 28%
Phone Idle 21%
Voice Calls 2%
I assume this is actually a better representation of what the list should look like than what I had been seeing for two weeks, but the other thing I noticed was
2. My battery was draining a lot faster than it ever had during the previous two weeks, even during idle periods.
My battery had consistently been draining at around 1% per hour idle until today. Now I'm seeing it drop 5% in LESS than an hour while idle (idle meaning the screen shuts off and I don't use it).
So my question is, what do Cell Standby and Phone Idle mean? Previously they had both been 2% and my idle battery use was excellent. But today they both shot up to the 20-30% range and I'm thinking this may account for the excessive battery drain even while the phone is sleeping.
Why would these two things be so high? Nothing changed between yesterday and today except that I turned off the phone and turned it back on. I almost feel like I messed something up by simply turning it off!