Hmmm ... so I used a RC charger and the drone battery seems to be good. However, when I flew the drone earlier today, the ST16 controller displayed the battery of the drone quickly dropping in voltage.. I almost wasn't able to land it before the RTH feature started. All in a 7 minute session. After I brought the drone in, I checked the battery against the RC charger and it displayed the battery as good?!? Note the attached images. Voltage for each cell, IR for each cell, overall IR, and the V vs Time telemetry. The IR is low which is good. The V is good. So why would the controller display the V dropping from around 90% to 20% in 7 minutes, and then when I checked the battery after, it still showed near 80%? Currently, as I sit here at home, the V of the drone battery remains at 80% (over the last 30 minutes ... granted it sits idle). I am at a lost. Follow up thought. The IR over the individual cells vary quite a bit, although all still low. However, I did note that cell 2 displays 0.0 mO. Maybe that is the culprit?