Iphone 4, empty battery after 8h, usage==standby time

Hi,
since some weeks I have the problem, that my iphone sometimes gets into a state, where the battery lasts only about 8h from full charge. I can see, that standby time equals usage time.
Restarting the device does not help, updating to the latest i-os revision also did not help.
Searching the internet I found several people having the same problem but no solution. (Even here in the forum)
Looking into the console via X-Code Device Organizer, I can see that it tries to sync with our exchange server, even though there is no vpn connection open:
Sep 25 11:31:31 unknown dataaccessd[25] <Warning>: EAS|ASGetOptionsTask failed: Error Domain=NSURLErrorDomain Code=-1004 "Verbindung zum Server konnte nicht hergestellt werden." UserInfo=0x1c51df10 {NSErrorFailingURLStringKey=https://192.168.99.211/Microsoft-Server-ActiveSync, NSErrorFailingURLKey=https://192.168.99.211/Microsoft-Server-ActiveSync, NSLocalizedDescription=Verbindung zum Server konnte nicht hergestellt werden., NSUnderlyingError=0x1c52d660 "Verbindung zum Server konnte nicht hergestellt werden."}
Sep 25 11:31:31 unknown dataaccessd[25] <Warning>: EAS|Unhandled url error code of -1004
Sep 25 11:31:31 unknown dataaccessd[25] <Warning>: EAS|Failed to get version string
Sep 25 11:31:31 unknown dataaccessd[25] <Warning>: EAS|Folder with id 17 and title Kontakte has failed to sync 1181 time(s) in a row
Sep 25 11:31:31 unknown dataaccessd[25] <Warning>: EAS|connection died with error Error Domain=NSURLErrorDomain Code=-1004 "Verbindung zum Server konnte nicht hergestellt werden." UserInfo=0x1c515400 {NSErrorFailingURLStringKey=https://192.168.99.211/Microsoft-Server-ActiveSync, NSErrorFailingURLKey=https://192.168.99.211/Microsoft-Server-ActiveSync, NSLocalizedDescription=Verbindung zum Server konnte ni
Does anybody have an idea how to fix this?
Regards
David

Hi, I think you need a new battery for your iPhone 4. Though you've said that the last time it is shut down with 90% of battery, there must be something wrong with your battery. You can buy a battery to replace the old one by yourself or take it to a local repair store to do the repair.

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