It may be a stupid question but, can you just isolate the low cell and apply a charge specifically for a closer match the other two (2) good cells? I have been using my stock balance/charger which came with my Phantom but noticed deceasing flight times and erratic behaviour during the charging process. It would bring the batteries ( I have three(3) of the same) up to the status of red/green blinking lights and then start blinking red only and alternate the red lights on the cells 1S, 2S AND 3S as if it was trying to balance the cells. I bought a battery checker which indicated the voltage in position 3S was very low in all three(3) batteries were always low. This low voltage in position 3S may be purely coincidenctal but then the thought occurred to me which is why I posted the above question. In the meantime I have just purchased a new IMAX B6-AC Charger/Discharger and shall try some of the methods I have seen on You Tube to try to recoup my existing batteries prior to disposing them. Sincerely, Grounded and looking for comments!