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why need a long time to charging the battery from 99% to 100% ?
up to half an hour until battery full charged (100%) from 99%
i hope this issue will be fixed in next Firmware Update 
sorry my bad english
it might be a bug
charge your phone 100% > let it drain to 5% > charge it to 100% > let it drain to 5% > charge it to 100% that should fix this
also it doesn't hurt to reinstall the update.
Don't forget to give Kudos
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Don't forget the Kudos