I finally found a guy where I live who was able to plug a laptop into my car and read the voltage levels of each cell. We turned as many accessories as we could on, and drove around in and out of EV to stress the battery to see how far the voltages were from each other. I am very happy to say that my 2008 with 121k miles is easily reporting a voltage spread no larger than ~.2 volts from each other! I am pretty surprised and very happy that this car should last some more years on the original battery. Hopefully it will last me 4 more years before I need to replace the battery.
