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      01-29-2015, 07:24 PM   #34
Needsdecaf
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Drives: 2024 G80 Comp xDrive
Join Date: Feb 2011
Location: The Woodlands, TX

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Was just reading chapter 6 of the complete vehicle technical guide found in the sticky threads. Based on what I am reading, it seems as if the car's alternator and charging circuits are designed for the Li battery. I won't re type the whole thing but the Li battery can take charge faster, among other things. I think there would be issues with a lead acid battery. Also, there is circuitry in the battery, which the car would likely not do well without.
Actually, reading further, the circuits in the battery are responsible for FIFTEEN different functions such as diagnostics, wake up, voltage monitoring, state of charge, etc. I would hazard to guess a standard battery without this would not let the car start, and might not let it power up!

Out of curiosity, the listed number of charging cycles for each is 350 for the lead acid vs. 5000 for the Li battery.
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