This really sucks (5.0.1).
View attachment 311868
Sadly that doesn't say much - it all depend on what "Usage" was.
Playing certain video, for example, you could pretty much drain the battery in four hours. The specs say "up to 10 hours". Hard usage of the cellular interface could also do it. The specs say "up to 6 hours" for "Internet use" over "3G". Even without the battery draining bugs that some are experiencing, they can't do the impossible. The specs are here:
iPhone 4 specs
If on the other hand that is the result after has letting it do nothing, it is obvious that something is not sleeping as it should and is eating up your battery time. If you would like to help getting this fixed, you could file a bug report on
https://bugreport.apple.com. They will probably send you back a profile that enables power logging, and you will send them back the logs.
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People do realize that different users have different usage behaviours.
Reading emails and browsing simple webpages is different than watching youtube videos. Different usage behaviours will result in different usage statistics.
Comparing that "Usage/Standby" statistic without further details about the nature of that usage isn't very meaningful.
Indeed, good put!
Also, iOS 5 has more user configurable settings that relate to processes running in the background. Try limiting the number of apps the use features such as the new notifications features.
Turn off any settings that are unneeded that may contribute to higher resource use via more processes running in the background
Every process that is running on your device contributes to reduced battery life.
I have to disagree a bit with this one though. I can't think of any of the built in features that should really have an impact on battery life, except for WiFi/3G/Bluetooth enabled/disabled.
Even most third party apps shouldn't have an impact.
If they are correctly written, they should all be to do their things in milliseconds per day, and that shouldn't be noticeable.
Then there are bugs, in both apple software and 3:rd party software, and that could certainly drain battery. To find those, you could certainly try to disable them and perform a systematic search, but I have still not seen anyone that has actually found a confirmed battery hog in iOS 5 this way.
Then there may also be other problems with some phones - for example some report that their phone never gets charged to 100 %, or that the time for charging from 25 to 100 % seems suspiciously short (like minutes when it should rather be hours). That sound like a hardware problem, or at least a battery charging software problem.