Insofar as I'm aware, the IEC approved protocol for determined the capacity of an NiMH cell consists of the following:
- Charge at rate equal to 1/10th of the cell's rated capacity for 16 hours.
- Allow the cell to rest for one hour.
- Discharge at a rate equal to 1/5th of the cell's rated capacity down to 1.0 volts.
The 16 hour charge at 1/10 of a cell's rated capacity is often referred to as a 'standard' charge.
As demonstrated by this image provided by forum member Quension, the IEC protocol may even be referenced in a cell's capacity statement:
Owner's of the Powerex MH-C9000 will note its Break-in mode approximates the IEC protocol.
While other capacity measurement methodologies can be better suited for determining a cell's actual performance under specific conditions, those methodologies are irrelevant insofar as determining a cell's actual versus its rated capacity.