Step 2: Top
Step 3: Getting ready to remove solder
Step 4: Finally!
Step 6: Corrosion
Step 7: Semi-cleaned circuitboard
Step 8: Just for anyone who's curious...
Another note for anyone who's interested in changing the batteries: they are a standard size but they are epoxied into the base with the same stuff that holds the coils. Remove them by cutting away the plastic film surrounding the cells, remove the cells, and then pull out the plastic.