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You can replace it, as long as you have the spare parts and check the videos on how to do so, but it will void your warranty.
Hi, you shouldn't have to replace it for a long time......by the time it needs replacing you will probably be using a Z6 Compact 
Hi grumpybear,
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Warranty wise, you would be best to have an authorised Sony Mobile repair agent perform the task, as they will also be able to make sure the device is water resistant after the replacement.
I really need to have my phone and not out for repair more than a day. Can I take it to Sony service location for a battery replacement without having to mail it away?