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Good writeup. The 128 is definitely a battery hog especially as my wife only drives short trips around town with AC and stereo cranked. I just upgraded my 2012 128 battery from the stock H6 70 AH to an H8 AGM 95 AH. It does fit using the last screw socket in the battery compartment but it is very hard to get the screw in - no room for hands. I had to use a pickup tool to get it started. Used a Carly to “code” the change to agm(used 95AH selection) and to register. For those intimidated by “coding” , its a simple menu driven selection - no typing or compiling required. The only slight issue was the battery module did not show up until I started the car. If you use a Wifi Carly adapter, you also have to disconnect from any other wifi network and select the Carly adapter to connect to the car. Should have been obvious but took me a few minutes to realize 🙄.
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