high timing performance
I don't need much output while driving. It would be usefull to me to know what cell is lowest, and maybe the difference between it and perhaps the average.
Open Circuit Voltage OCV Measuring a battery's open circuit voltage is not a reliable measure of its ability to deliver current. As a battery ages, its internal resistance builds up. This will reduce the battery's ability to accept and to hold charge, but the open circuit voltage will still appear normal despite the reduced capacity of the battery. Comparing the actual internal resistance with the resistance of a new battery will provide an indication of any deterioration in battery performance.
I want to avoid that the cells get out of balance with each other.My first thought was to connect all separate cells to an Arduino (with som I/O extenders?), measure the voltages, compare them and act upon differences. (ie. warn me or something)
"Battery MONITORING system"
This is the system I was discussing.The MAX6921 might be used, or the other demux chips discussed above.Note how each battery is connected to nothing until a relay is closed.A change is needed in the the Gnd for the battery WOULD NOT the GND for the Arduino, demux, & relay coils.The two would be isolated so that the measuring electronics only connect to the battery under measurement +/- terminals.