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BQ40Z50-R2: critical fuel gauge parameters to be tracked in order to generate a remaining useful life model for the battery

Part Number: BQ40Z50-R2

hello, tech support at TI:  

i am seeking your recommendation on a vital signal to track the performance degradation for the rechargeable battery since we are using bq40z50-R2 as fuel gauge, here is a list of parameters i would like to track: 

1) impedance tracking and

2) SOH measurements. (pack level) 

3) QMAX parameter. (which is the max capacity in mAH) on a per-cell basis.

4) charge cycle count 

the goal of the task to come up with a remaining useful life estimate model for predictive maintenance schedule based on the health monitor log file database.  

 i am seeking your recommendation to confirm if i capture all the critical parameters or some parameters in my list is not critical or if i miss any critical parameters to be captured in the fuel gauge ? 

Thanks

jason