Instructables

Step 2: Remove battery "pack"

Picture of Remove battery
carefully pull the battery pack out of the holder
 
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Beanal1 year ago
Use a small screwdriver to pry out each of the12 NiCad cells from their battery compartment. Some are soldered as this provides a better connection and helps stop the cells from shorting. If they're soldered, heat a soldering iron and touch a soldered cell terminal with the soldering iron until the solder melts. Remove the soldering iron and quickly pry the cell away from the connection before the solder hardens. You must do this on all 12 cells.
http://www.drill-battery.com.au/batteryshop.php/dewalt_power-tool-battery.html