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1. Charging of the battery is a delicate balance and the ECU needs specific data to ensure appropriate charging (i.e. specific amperage, etc.). This requires re-coding after installation so the ECU is aware of a "new" battery and/or any changes from the new battery (different CCA etc.).
2. Search any of the forums out there and you will see that there has been variable degrees of success NOT coding, but the consensus seems to be that re-coding will avoid premature battery drain/incorrect use from the ECU.
I know, I know....it's mind-blowing that they've overengineered it to this extent, but the specific batteries in our vehicles (AGM) are different from your same ol' same ol' and aren't "wet" but a different composition and therefore vent less gas into the vehicle (bearing in mind that they really are IN the vehicle more or less).
Best of luck. I am in the same situation and I'm infuriated that I can't just swap it out...
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Good-bye, ol' Paint...
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