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This is related to the subject
http://talk.sonymobile.com/t5/Xperia-Z3-Tablet-Compact/Qualcomm-Quick-Charge-2-0/m-p/931101
Go to settings > power management > battery > what is using up your battery, if you can tap on the graph, take a screenshot and post it here or upload it to box or dropbox and post the link here.
Do you have an antivirus or taskiller?
Uninstall it > restart your phone > check again.