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Repair - Gameboy battery upgrade
See my other Gameboy related pages
a plan to hack them and I needed some guinea pigs. I have already 2 at home but ... well, it was a total of 1,500 JPY (10 euro w/ delivery) so. Got them yesterday morning, quick check: all working modulo the inevitable sticky buttons or gunk that went everywhere after 15 years. Dismantle, wash (water & soap), remove glue (ugly pokemon stickers) and marker (acetone), dry, reassemble. Working fine, nice looking and that vomiting man-sweat smell is gone (previous owner must have had very sweaty hands).
One of the GB color had one battery electrode completely corroded by leaking battery (thanks "sweaty palms" for sending me the leaking battery too, appreciated). So I replaced it with one of the other GB color, worked like a charm. Then I saw that abandonned GB color without its original battery connector destined to inactivity ... unless ... hey, I was playing with some Li-Ion battery from old cellphone the other day, I even plugged one to those 2USD ebay Li-Ion charger. Hum, 3.7v & 1,100 mAh looks good that could power the GB, but 3.7v is too much, I need 3v. Wish I had some way to regulate that, but buying or making a buck converter looks boring, and buying on eBay takes time. If I could just drop those 0.7v it would be perfe... 0.7v drop? Hey, silicium diodes do that! %20 reverse polarity protection! Eureka!
For those who are curious, the battery has a massive lifespan, like more than 10h straight. I did the test: turn on the GB, start a game or let the tetris demo run, I never saw it run out of battery even after 10 or 12h straight... impressive.
By the way a good video about Li-Ion battery from Mr. Dave Jones http://www.youtube.com/watch?v=A6mKd5_-abk
Thank you Hackaday for featuring this page (^_^) http://hackaday.com/2015/01/01/game-boy-with-lithium-batteries-and-usb/
Very simple, the diode does the drop of 0.7v meaning you'll feed your GB ~3v which is what she needs. Li-Ion charger goes also before the diode.
WARNING: Don't try to play and charge at the same time, not sure what will happen, but nothing good I fear.
Steps to assembly:
PS: go easy with the acetone. Gameboy plastic melts with acetone, which can be what you want to do (to remove the rough aspect of a piece of plastic you sawed or sandpapered) or it might lead you to unpleasant effects. Indeed, GB plastic is not flat like a sheet of paper but has a fine grain. Wiping your GB with acetone will remove that grain, so know it before starting, or you might end up having to polish the whole baby with nail polish remover (the cheaper the more acetone there is inside).
Thank you Mr. Sweaty-palms, that's a nice acid-eaten battery connector here.
Prototype: wires soldered on the battery, and ad'hoc soldering on the GB back. Worked fine.
Prototype: some details of the back. Notice which screw were reused to secure the USB charger.
Now on to the real thing: red circle is the diode, blue circle is the USB Li-Ion charger
Cut, drill, glue, ...
While charging you get the red light, blue one when charged.
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