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Based on my experience, the Deka ETX30L DOES NOT WORK. I have tried two. I have no extra sound system or electrical components. For those who have had good luck with the Braille, then I would say congratulations, the Braille must be a better battery. However, the Deka does NOT have the juice to start the car without causing gremlins. I have hooked them up to my CTEK MUS 4.3, and charged to absolute full. Even at full, with ignition on and engine off, they read at about 11.4-11.7v. Well under 12v (which is already under the recommended minimum of 12.5v for starting). For anyone reading this: DO NOT buy a deka ETX30L for your E9x M3.
Very sad when misinformation on these forums leads suckers like me down these roads of trial and error, but please please learn from my mistakes and do not try this.
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