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If it's a single mosfet to disable discharge, its body diode would still allow charging of a deeply discharged cell. The safest way to attempt recovery of a deeply discharged cell is to attempt recharge at low current maybe 0.1C or 250mA max for an 18650 for up to 10 hours or so. If it's voltage recovers to normal minimum or more (but don't let it get over 4.2V) congratulations!!! If it doesn't, the cell is garbage now.