Coulomb counting has issues with accumulated error in any system. LFPs just make things worse. Consider that if the counting is off by only 0.1%, then if you on

Coulomb counting has issues with accumulated error in any system. LFPs just make things worse. Consider that if the counting is off by only 0.1%, then if you only use coulomb counting to determine state of charge, you will accumulate a 10% error after only 50 charge and discharge cycles. Voltage based readings to "reset" or calibrate the maximum/minimum set points are extremely important. For LFP batteries, they need to be very close to the 100% state of charge to accurately measure. Regular lithium ion can be measured at much lower states or charge (70-90% usually, to my knowledge).