51% more power when using DCB547 XR FLEXVOLT 9Ah battery compared with DCB184 18V XR 5Ah battery. 42% more power when using DCB546 XR FLEXVOLT 6Ah battery compared with DCB184 18V XR 5Ah battery. NO LOAD SPEED (DRILLING/ DRIVING MODE) 0-450/1300/2000 RPM.