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Message: <blockquote data-quote="2023 LTZ" data-source="post: 8833569" data-attributes="member: 686684">I appreciate your thoughts. What of the battery manufacturer recommendation not to mix types of batteries? Is that not a concern?I live in the same town as the interstate North American distribution center and I’m black listed there, well at all interstate retailers bc they believe something w my car is responsible for the killing of these batteries. I spoke with a local installer who had a very similar vehicle in w stock alternator, no cap and a second battery in place but that vehicle didn’t go below 13.5v. The proprietor said that persons system was 3k where mine is 2. His recommendation was have the auto parts store check the ho alternator bc in his experience the alternator should instantaneously respond to this demand placed on the system. I’m inclined to disagree with that.So, having two batteries of different types is ok and they don’t feed off each other?</blockquote>