The Dyson DC16 Root 6 is a handheld vacuum that provides approximately six minutes of continuous cleaning between battery charges. Typically, a person removes the lithium-ion battery (part number 912433-03) to charge it in the wall-mounted battery charger, replace it if defective or spent, or when repairing the unit or replacing other parts. The battery has a simple slide-button release lock. As a result, you should have no problem removing the DC16 battery within a few seconds of sliding the button.
Grasp your Dyson D16 by its handle with one hand.
Hold the cleaner with the back end facing you.
Place the thumb of your other hand on the battery-release button and your fingers beneath the battery.
Slide the button toward you, hold it in place and then simply pull the battery straight out from the unit.