I'm going to paste in the balancer manual excerpt (210 Thunder Power) so you can see what they say. That one cell is definitely well off from the others. I hope this is some help to you. Fred

A: Imbalance under 0.03V: yellow status LED “on”, red LED(s) “on” for 5 seconds
Proceed with normal charging
If yellow status LED “ flashes”, pack average voltage is below 3.6V

B: Imbalance 0.03 to 0.2V: yellow status LED”off”, red LED(s) flash for 5 seconds
Charge at 0.3A to balance the pack or proceed carefully with 0.5C charge.
If yellow status LED ”flashes”, pack average voltage is below 3.6V, Proceed with normal charging

C: Imbalance over 0.2V: yellow status LED “off”, red LED(s) flash for 60 seconds
Battery may require repair (Keep battery plug into the balancer for auto self balance, do
not charge battery until bleeding/balancing stop)
If imbalance remain >0.2V, balancer continues beeping every minute for 10 seconds.
If yellow status LED begins flashing, pack average voltage has dropped to below 3.6V
You may charge the battery at 0.3A and monitor charging for one hour, if the beeping stop
but bleeding continue, unplug the charger and balancer to retest the pack with balancer.
If beeping continue, you need professional help.
Additional audio alert:
Cell voltage below 3.2V, audio beeps for 5 seconds
** Note: when the “START” button pressed again, the checking display will be repeated.