Can overdischarge condition be released when it is in the overdischarge protection mode and battery voltage restore to overdischarge release voltage (VDR)?

No, the overdischarge condition only can be released by charging the battery. (When it is in the overdischarge condition, the CS pin voltage is pulled up by the internal resistor to VDD in the IC. At this time, power consumption is minimum, which is below 0.1uA. The IC enters into SLEEP MODE”, only charging the battery can relieve this mode.)