Originally Posted by swamp2
Yes a big +2 on the question. The Braile guy I talked to said their 3121 battery is perfectly suited to the E9X M3. I mentioned problems I had with Comfort Access but I suppose it could hav escaped him that I said that. I sure hope the answer is not yes...
Just measured the voltage on my stock battery in the car: 12.46 V.
The Braille battery sitting on my desk: 12.74 Volts.