Hi,
Does it do this when using the phone in safe mode or disabling mobile data?
If not it may be downloaded apps i.e. apps that you downloaded and installed not that came pre-installed with the phone, that may be downloading in the background unbeknownst to you and this is depleting the battery faster.
Also try turning off the WiFi and/or BT if they are turned on as when on they are constantly looking for new networks, other BT device etc this may be causing the battery to drain faster than it normally would. You can check in WiFi Preferences and BT Connection preferences to see what is enabled that maybe you don't want
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