Hi all, I have been noticing that my HV battery appears to have a little less capacity (drains a little earlier), but all cells appear very close to one another in terms of voltage and internal resistance. Also, the DeltaSOC is 0% as reported by Techstream through the miniVCI. What's your opinion on the state of my battery? What exactly is deltaSOC? It's a 2004 Prius at 160k miles.
Your battery appears to be in good shape. DeltaSOC is a measure of the differences in the State Of Charge between module pairs. Note that there are 28 modules in a 2004 Prius HV battery and each one has 6 (1.2 volts each) NiMh "cells" in series. Your Prius monitors them in pairs (14 readings) as all of the modules are connected in series to generate the 200+ volts of the HV battery. JeffD
