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After my Interstate wet the bed this week from 3 weeks of screwing around with the radio install, I just picked up a new battery. Stereo geeks suggest that it's good for clean power and better (in their opinion) than the Optima brand- which does not show a direct replacement for the E53. I believe that many others have used an Optima in an E53, but I liked that this brand had a direct replacement.
It's expensive @ $350 delivered, but I'll replace it myself.
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