battery overdischage oscillation protection
200mV positive feedback from is added to input of comaparor to add hysteresys.


This may not be enough. A discharged battery has higher internal resistance, the voltage drop can be much bigger than 200mV depending on load current and battery chemistry. 

Some sort of latch is probably a good idea, but keep in ming that this circuit should consume as little current as possible - otherwise the battery might get damaged in under-voltage condition.