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setting up my graupner radio with telemetry. would like to tap off the balance jack to get an individual cell voltage. i was tapping off the whole 5s battery positive lead and was using 18 volts as a resting voltage, but would rather go to individual cell voltage to make it easier for me to recognize at 3.6 volts. I soldered the sensor wire to a pin from an old balance board jack and plugged into the wire next to the neg wire on the lipo's balance jack and the sensor reads 15.4 volts. why?