Wii U Large Battery Case

My original Wii U gamepad battery started dying in an hour, so I wanted to get a new battery. Nintendo used to sell a larger battery for the gamepad, but they stopped doing that long ago and there's no point buying a used one since it probably won't last long either. So then I considered getting an after market battery. After reading reviews it seems like those are hit or miss with some brands lasting for less time than the original small battery. Ultimately, I decided to just make my own.

The largest easily available battery I found that can fit inside the gamepad is a 605080 LiPoly 3000mAh 3.7v Battery. These can be found anywhere online through either amazon or ebay or even aliexpress. The beauty of this is that even if this battery doesn't last for very long you can always just make a new one for a few bucks.

The next thing you'll need is the charge control board from the original Wii U battery. This is definitely the hardest part of this upgrade since you need to actu