Replaced battery & charging port on 6p. Battery still drains at 1% per min.

My Nexus 6p is barely over a year old. Does not rapid charge and battery drains almost 1% every minute. Even when unused.Have ruled out all possible ROM issues. Have gone back & forth to all stock ROMs, cleared cache/reset everything. Still no go. Certain it is not the ROM.

Replacing the battery & the charging port has not resolved the issue. What else can I try replacing? Any suggestions?

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