Need help on a battery repair - RC Groups

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Need help on a battery repair I have a pulse 6s 5000 battery I purchase a helicopter use it came with 2 battery I check them and one battery was good the other the number 6 cell was low I charge them bother and look ok the IR on the number 2 battery 6cell was high it took charge all look good I did a test flight hover after my test flight all cell were at 30% except on the number 2 battery the number 6cell is dead this batteries have no puffy all the other cell have good IR in the single digits can that cell be repair and who would do that or should I just dispose of it suck because all the other cell all good on both battery

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