SOC SOH SOF

**a coulomb counting method,
**voltage method,
**Kalman filter method

https://www.analog.com/media/cn/technical-documentation/technical-articles/A-Closer-Look-at-State-Of-Charge-and-State-Health-Estimation-Techniques-…_cn.pdf

practical circuit construction rather than pure theory and equations
http://afrotechmods.com/tutorials/

  1. Accurate Electrical Battery Model Capable of Predicting Runtime and I–V Performance

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.227.4482&rep=rep1&type=pdf

Prediction and analysis of model’s parameters of Li-ion battery cells