How do I install and remove the battery pack on the BCD704C1?
To install the battery pack (8), align it with the rails inside the tool handle and slide it in firmly until it is securely seated. To remove the battery, press the release button (9) and firmly pull the battery pack out of the handle, then insert it into the charger.
From the official Black & Decker BCD704C1 Drill/Driver manual, page 10
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