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Message: <blockquote data-quote="hispls" data-source="post: 8833567" data-attributes="member: 614752"><p>I'd say additional battery yes, isolator, no.  By my estimation there are very few car audio applications where an isolator would be appropriate.   Get the biggest parts store "premium" branded AGM battery you can bear the size and weight of and chose the one with the longest warranty.   Pep boys used to sell Bosch brand with 3 year warranty which was pretty nice.  Before getting into lithium (I wouldn't recommend lithium for 2KW audio system) I used to do that and parts store batteries are always no-bullshit exchange if you kill them within warranty.  Drive to the local parts store and the kid behind the counter checks your receipt and hands you a new one, easy peasy compared to the cost/hassle of having to return one to some boutique battery brand on the other side of the country.</p></blockquote><p></p>