SageBrush wrote: lorenfb wrote:
LeftieBiker wrote:As far as I can tell, the Hx reading is no longer any help at all, starting with the 40kwh packs. It makes no obvious sense as it once did...
To most before, it didn't make much sense. Never really could understand the preoccupation some have/had. SOH or the ratio of present
Ahrs to max Ahrs are more than adequate to assess the battery's condition.
That is mostly my opinion too although I thought Hx was a marker of battery resistance.
Hx declines as the battery ages, as has been noted on MNL. Battery resistance increases with battery age. Given that, a logical
conclusion is that Hx represents the ratio of the new/original battery resistance to the battery resistance as it ages (present),
or the ratio of conductances (present/new).
With regard to the 40kWh battery and Hx, it's possible that the original BMS firmware for Hx wasn't tweaked for compatibility.
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=78, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 8.5K miles, 115 Ahrs, 5.2 miles/kWh (average), Hx=98, SOH=99, DOD > 20%, temp < 105F