I recently left my 3s 2200 plugged into my plane over night by accident, and i found this way to help get the battery back from being fully discharged, thought id share it with you guys here so you know
but also be warned the battery may not preform as well after getting it back so keep an eye on it
Connect your pack without the balance connector
Set the charger to nimh mode
Set the charge current to 200mah
Charge until the voltage reads at least 3.0v per cell (watch screen constantly) for example 6v for a 2cell 9v for a 3 etc
Stop charger and change mode to lipo
Connect the balance lead
Charge as you would normally
this worked for me tonight so I thought Id share it