Your info section indicates that Hx may be a measure of battery resistance.
This is pretty widely known - even I know it. Why are you looking for a measure of internal resistance other than Hx and SOH when they correlate so well with degradation?
From the other thread; viewtopic.php?f=27&t=25519&start=40
It would be insightful, if those with an '18 Leaf, or the 30 kWh, would use LeafSpy and post the value for the battery's internal resistance.
This would provide a key parameter of their battery chemistries and the thermal effects from multiple QCs/driving leading to battery
degradation. That data (battery resistance) for the earlier Leafs have been posted. If one assumes that the later Leafs have the same
battery thermal resistance to ambient, but a greater series resistance, those batteries would potentially remain hotter longer from
QCs/driving. The implication then, given the lack of TMS, is greater battery degradation than earlier Leafs.
If Hx is an actual measure of battery resistance (ohms or mohms), then assigning a % to doesn't make sense unless the Hx implies
a percentage of a battery resistance relative to 100% SOH. So with Hx equal to 115%, that would indicate battery resistance is now 115%
greater than when it was new - hard to believe. More likely if Hx is related to battery resistance, then it's in mohms and not %.
Leaf SL MY 9/13: 70K miles, 49 Ahrs, 5.1 miles/kWh (average), Hx=70, SOH=78, L2 charges to 100% > 1000, max battery temp < 95F (35C), min discharge point > 20 Ahrs