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Message: <blockquote data-quote="PoManNox" data-source="post: 25538" data-attributes="member: 8300">Have you owned your 2018 since new?  Need more info:  How many miles on it? Any aftermarket electronics on it?   When exactly did you swap batteries?   Does the new battery pass a load, crank and charging test with a digital tester? (can buy these for $35 online).   Need to run all 3 tests for the most accurate "test".The reduced engine power thing in the very cold can be a frozen, partially blocked charge air cooler.     Just throwing some things out there, but you really need to scan for codes.    One last thought, is the auto stop/start still active on it?   You need to bypass that ASAP if so.   It does nothing good electronically or mechanically for the vehicle.</blockquote>