Before I went to bed last night, my iPhone battery was at 30%, with about 6 hours of active use (since my last full charge). This morning however, when I woke up, I discovered that my battery was dead. After some inspection I found that it had been used continuously for 12 hours. This means that when I sleep someone played with my iPhone for 6 hours, or
Some apps running in the background are silently draining my iPhone battery, even though they shouldn’t
Possibility 1 is very remote. So I wanted to investigate possibility
2. How to know what’s causing your iPhone battery to drain when not in use?
I turned off 3G and WIFI when I went to bed. There is a page of general tips for maintaining long battery life, as well as general terms about battery replacement.
Personal opinion: It sounds like the iPhone smartphone battery battery is bad. It sounds like after a certain point of discharge it no longer holds a charge. Keep in mind that iOS multitasking isn’t really multitasking. There’s (almost) nothing your phone can do for more than 20 minutes straight except streaming audio (which is actually usually persistent audio).
I’ve been playing audio at about 40% for a few hours (maybe 5 hours?) during the day, and by the time I finished it was really below 20%, all on an iPad, too About the same. iPhone 4. Connected WiFi, 3G (on iPhone) is enabled, but of course not the active radio being used.
I don’t know if you can see what drains theApple battery, Apple disables “task management apps”. One possible fix is to see if an app is involved or the battery is low, i.e. draining the phone to a similar level, open the quick app switcher bar (double click on the home button), tap and hold on any app in the taskbar until They start “shaking” and then press the white minus sign inside the red circle on everything. This will kill all non-first party missions. (For example, it won’t stop allowing Mail, Phone, Safari, or other built-in apps to perform occasional chores/tasks.)
Having said that, to test properly, make sure auto-fetching of messages is turned off (or in push-only mode at best), and make sure there are no tabs in Safari with “live” or auto-refresh content. As far as I know, Safari is allowed to go into the background and has always been able to do so. At least since iOS 2.something (I started with iPhone 3G).
If you have an Exchange email account, you might have some outdated sync threads. Try this:
Go to Settings/Mail, Contacts, Calendars. Click the account name. Turn off 3 switches. Return to the main settings page. Now launch Mail, then Contacts, then Calendar to terminate the pending connection. Restart your phone, go back to Settings, and turn the 3 switches back on. This might fix it.
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