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I just used Engineering Test Mode to light up all lights on dash. There is no "battery light display" on the dash. I confirmed using the FORScan APP that the procedure did reset the battery age and PIDs used to accumulate flow in / out of 12 V battery to zero. Unfortunately, the C-Max doesn't have the normal 12 V battery symbol on the dash. So, without FORScan to validate, I guess you could do the procedure several times hoping that one made no entry mistakes in at least one manual battery age reset.

Did you get any sort of confirmation after doing these steps? I've read elsewhere that the battery light in the dash is supposed to flash three times if the BMS reset worked, but nothing happened for me when I followed your instructions. Thanks for the help!

https://forscan.org/home.html This site has info on adapters and links to the APP. The required OBDII adapter and App depend on what OS you are using on your device. Most times cheaper adapters will work but if you are going to record data, you’ll want to use the FORScan recommended ones as the cheaper ones may stop in the middle of a recording resulting in loss of recorded data. In addition, if you want to scan modules on both the HS and MS CAN, make sure the OBDII adapters can do this either automatically or with a toggle switch.

Get an ELM327 adapter (as low as $8 to $80 for one that can scan HS and MS modules automatically) and download the free Windows Forscan App to a windows tablet / laptop / PC and reset the 12V battery data. I believe you have to request the extended license and Forscan will send a code to unlock the App. It doesn't matter how much you pay for a car as to whether to reset the battery or not. The charging and load shed algorithms need correct data to keep track of the State of Charge of the battery to hopefully maximize life of the battery. If you feel paying 1/2 hour labor is too much, don't do it.