Step 1: WARNING PROCEED AT YOUR OWN RISK
Step 2: Parts and Tools
soldering iron with some solder i used rosin core
a tri wing screw driver (you can get one on ebay)
small Philips head screw driver (for you solar light or if you need to remove the circuit board from the gameboy)
power drill and drill bit or a dremel tool (for making holes for the panel wires to come out of)
forceps really help with soldering wires
a helping hand tool if you need one
a lighter (in case you solar panel won't come out of the solar light)
a gameboy of course, this can work with most items that run off of 2 aa batteries but thats up to you to try out
a solar light that runs off of 1 or 2 aa's, if you can buy the 2 aa version so you wont have to buy new batteries
2 rechargeable aa batteries (even if you get one in your solar light please get 2 matching batteries it matters)
some Velcro (if you want to be able to adjust the panel)
glue if you want to permanently attach the solar panel to the gameboy
spare wire in case the solar panel wires are not long enough
Step 3: Dismantle the Solar Light
every light will be different but with mine i just unscrewed and took it all apart byhand, unsoldered the battery connections then took about 20 minutes removing the solar pannel without breaking it. the way i removed the panel is i heated up the metal shell under the panel with a lighter melting the glue one corner at a time until it final released. just make sure you dont over heat the metal or panel and dont snap it. once you removed the panel from the casing snip the wires connected to the circuit board insuring you get the most length for your solar panel wires.
you can keep the shell, led, photo resister and any thing else you want for another project.
Step 4: Taking Apart the Gameboy
Now there are 6 screw 4 in plain site and 2 under the battery cover. So remove the cover and both batteries and unscrew those 2 screws. Now carefully lift the shell away from the rest of the gameboy and put both halfs to the side for the next step.
Step 5: Preping the Pannel
Step 6: Preping the Gameboy Shell
now slip the 2 wires through the back of the shell and figure out how you want your panel to sit. now either glue you panel in the desired spot or use velcro like i do so it can always be moved when you reopen the gameboy or want to readjust it.. if you do use velcro like me make sure the softer fuzzy side is attached to the gameboy and the hard scruffy side to the pannel so you gameboy doesn't get stuck to random things and when your hand rub against the Velcro it doesn't hurt.
you may also need to make a small notch where the battery terminals fit so the wire on't block the shell from fitting in.
Step 7: Make Gameboy and Solar Panel , One
tin both of the wires and battery contact with solder and make sure you do not apply to much heat or you can damage the board, so if you can use heat sync clips that most soldering kits come with
once you have the panel wires fed through the back of the shell, solder the positive wire with the diode to the back or bottom of the positive terminal (the one without the spring) of the gameboy. now solder the black wire to the negative terminal (the one with the spring)
Step 8: Put It Together and Test
if the shell wont fit figure out what is blocking it from closing , you may need to move the wires a little or make a notch in the shell by the batteries like i did, just make sure you dont take out to much or the batteries wont meet the contacts.
once it all fits pop 2 rechargeable batteries in and give it a test, if it still powers on, remove the batteries and then screw in all 6 tri wing screws. if it doesn't you may have crossed a wire or over heated the board.
now how i tested it to make sure it charged is i used up the power in the rechargeable batteries then l left the gameboy in my window for about a full day and then tested it to see if the batteries charged.