The Gameboy system uses four (4) AA batteries.

Turn over the Game Boy system and note the closed battery compartment.

Use your fingernail to get underneath the battery cover latch. Proceed to remove the battery cover.

• Be careful as this type of spring-clip is part of the cover itself and can break easily.
• The plastic tabs at the bottom of the cover and the corresponding slots on the GameBoy unit must line up during re-assembly.

Remove each battery. Prying outward from the positive (+) terminal is the easiest way.

• Do not dispose of used batteries with standard waste. Please refer to your local recycling department for proper disposal instructions of used batteries.

Pay close attention to the proper orientation of the batteries prior to insertion. This is clearly labeled inside the compartment.

After fresh AA alkaline batteries have been inserted correctly, replace the battery compartment cover with care.

• Always use fresh batteries when replacing old ones. Never mix batteries as explained why in detail here: http://www.ehow.com/info_8523093_not-two...

Remove the 6 screws on the back of the Game Boy system with a #00 Phillips Screw Driver.

• Some Game Boys may have tri-wing screws securing the back case, rather than Phillips.

Place these screws in a safe place.

Be careful with these screws as they are easy to strip, and if this happens then they are almost impossible to remove.

Gently separate the front and back of the system, taking special care not to damage the ribbon cable connecting them.

Once you can see the ribbon cable, move the screen side down a little bit to expose the ribbon cable connector.

Grip the ribbon connector with your thumb and forefinger, pulling gently until the ribbon connector comes out of its socket.

The pieces should be completely separated and appear as shown in the image.

Note the location of mounting screws for the circuit boards.