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[ML49]

I changed the battery on my Z2, to which I knew was better, after that it doesn´t starts only flash red 3 times when I press the on button, put in the second battery that sat in the beginning the same phenomenon flashes 3 times refuses to start, the worked without problems before I changed battery.

[Hampus]

Unfortunately, it can be hard to pinpoint for any one of us at the support forum what the cause can be. If it worked fine before changing the battery, something may have gone wrong while doing this. Have you tried to charge the phone for a longer time to see if it powers on afterwards?

Otherwise, I suggest that you visit nearest service center to have the phone examined by a technician. You can contact your local support team for further information about how to proceed with this:
http://support.sonymobile.com/global-en/contactUs/