Lately it's been shutting off and telling me I need to hook it up to a power supply before it's even alerting me that it's low on battery. It's getting worse with each charge cycle though. First it would die around the 20% mark after the meter in the corner showed red (low battery), then I would charge it completely and it would die when it's still green but close to low. This has been happening for several days. Last night after I fully charged it, I noticed that the meter wasn't going down at all for an hour or so of use. I changed the setting to show me how much of the battery was left in percentage and it said 100%. Eventually it started going down, and today it died at 40% battery. So I think the battery is lasting fine, it's just the gauge/meter is out of sync. Restarting my phone didn't prove successful to fix this. Google/apple.com isn't really helping.