I don't know why you think it's worthless. The SOH-C has jived well with the Ah recorded for my case as far as I understand. Here are the additional numbers in Ah I recorded for those miles.Those numbers are worthless the number you should be looking at is “full amp hour capacity” it is 63.0ah when the car was new and the only number that doesn’t fluctuate and goes down as the car ages and miles are piled on. Gives you the batteries capacity, what you do is multiply the amp hours x volts in our cars it’s 364volts, then divide that by 1000 to get battery pack capacity.
In any case, I want to share that I am losing 3% per 5k miles so far.