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What pic are u speaking of? Do u or have u programmed a microchip to perform such functions?
Well u figure the sync button takes about 1000 ms or 1 second of a hold before it does its main function. As long as u write your code to tap the sync button under say 300 ms or maybe even 500ms it should perform the request to the pic without the main sync function take place. I unfortunately have no knowledge of writing programs but I do understand how to make mods and the timings that can be applied. As long as the pic registers the sync being tapped "held down" for under 300 MS "just to be in a good safe zone" then the main sync function should not be compromized and it should register the command to the pic.
Here's a link that shows a Xbox 360 cg2 board scanhttps://www.acidmods.com/forum/index.php/topic,34543.0.htmlIf u look were the sync button is it shows a via or trace that can be solderd to or u can solder it directly to the sync tac switch. There are three tiny pins on the sync tac. U would need to solder to the middle pin to connect it to the sync button. That or scrap the green coating of the via "that's detailed as a purple line" from the sync exposeing the cooper trace. No matter the soldering location u choose its a tricky place to solder and is pretty much the hardest spot to solder to on the 360 controller.
Yes I'm sure u can use the battery. It should say if it operates @ 3.7 v. That's the sourse of voltage u want. U might want to look at the mAh on that battery. If its 1000 mah that's roughly 10 hrs the battery will last. If you want to check what connections go where on that battery u should purchase a multimeter reader. They are very cheep and u can find them at almost any hardware store or radio shack. Besides a multimeter will come in handy in so many was on your project, that or u have a one and two chance of soldering to the right pad. Once u charge it u will know if u wired it wrong and its as simple of just soldering to the next pad over. One last thing would be to think about space. Without having your wired shell u can't test to see if that battery will be to big to fit in your controller.