If you are using the 0.5C charge rate rule (1/2 of capacity) just round down to the nearest rate. The FAQ from Maha Energy's site used say that but is implied from the chart the currently available. Downloadable as a PDF (link in FAQ page)
FAQ - MH-C9000 Charger - Powerex Support
What are the recommended charging and discharging current for my battery?
The recommended charging current is 0.5C, or 0.5 times the battery capacity. The recommended discharging current is 0.25C, or 0.25C times the battery capacity. Here are some settings for common batteries:
2700mAh Charge: 1300mA Discharge: 700mA
2650mAh Charge: 1300mA Discharge: 700mA
2500mAh Charge: 1200mA Discharge: 600mA
2300mAh Charge: 1100mA Discharge: 600mA
2200mAh Charge: 1100mA Discharge: 600mA
2100mAh Charge: 1000mA Discharge: 500mA
2000mAh Charge: 1000mA Discharge: 500mA
1000mAh Charge: 500mA Discharge: 200mA
900mAh Charge: 400mA Discharge: 200mA
850mAh Charge: 400mA Discharge: 200mA
Note: For better life they used to recommend using a lower charging rate of 0.4C.which produces less heat during the charging cycle. The caution was if you went too low the charger might not detect the voltage spike the batteries produce to end the charging cycle.