How do I install and remove the battery pack on the CMCE040?
To install, ensure the tool is in the off position, then align the battery pack with the rails inside the tool's base and slide it in until firmly seated. To remove, press the release button (item 4) and firmly pull the battery pack out of the tool base. Make sure the battery pack is fully charged for best results. (Page 9)
From the official Craftsman CMCE040 Soldering Iron manual, page 9
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