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Multiple dead batteries on 2021 eTorque

I hit that with some steel wool. Seemed clean enough.
Put some petroleum jelly (Vaseline) over the connection - it will help prevent oxidation corrosion. First thing I do with a new vehicle is take a q-tip and spread a thin film over the battery posts and ground point. Never had a corrosion issue with any vehicle because of it. Simple and cheap trick.
 

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