Your description sounds like a supply problem.
If you were to try using a battery that had been discharged beyond the safe level and attempted to throttle up, the 5Volt rail would drop causing the receiver to brownout and the quad go into failsafe.
Things to check with the props off.
Check the output voltage of the battery when throttling up.
Check the output of the 5Volt regulator when throttling up. If the input to the voltage regulator falls below a certain level it switches the output off. This would result in a momentary power down of the receiver and the flight controller.
Also look at the battery lead connections. In the crash they may have been cracked. They might be able to handle the very low power requirements of the quad when idle but not the increase in current requirements when “the taps” are turned up.