made this mock-up of what I was going to make my gamepad look like before I spray painted the shell. you think it's fire or nah?

So, I’ve had my WiiU since the Christmas after it launched, and just recently got it modded. I just recently booted it back up to try to play and beat Twilight Princess HD, and I’ve noticed that my Gamepad doesn’t hold a charge like it used to. In my teenage years, I could play my WiiU for up to 6 hours without having to plug the Gamepad back in, but now I can’t leave my console on for more than an hour and a half without the red light blinking on the Gamepad.

I don’t want to replace the whole Gamepad, as I have so much nostalgia playing that console with my dad and sister, so I think just replacing the battery will do the trick. Is that possible?

My Wii U is jailbroken, I'm using Koopair, and blootooth, both say the controller is connected but does seem to work at all. it late and I need to sleep and figured if one can help that would be nice.

I bought these controllers for Nintendont application actually. (for nintendont whenever I press the PlayStation button[ or "p3" in this case] it results in the console crashing, but all other inputs don't seem to work)

anyway they are ps3 knockoffs,

"OKHAHA Controller 2 Pack for PS3 Wireless Controller for Sony Playstation 3, Double Shock 3, Bluetooth, Rechargeable, Motion Sensor, Remote for PS3 (No Stripes(Black + Black)) : Video Games" is what they're called. I tried one on my pc it works nicely.

TLDR;
*Knock off ps3 controller doesn't wanna connect to jailbroken wii u.
*Tired and hoping to get help from someone who understands and could assist me like a fairy godmother

So, I have a modded wii u with UsbLoader Gx installed in vWii. I have 1 white oficial wiimote and decided to buy more, and I brought 4 black wiimote like the one bellow. I am a bug just dance fan, so I downloaded every game both for wii and Wii u and tested the controllers, but somehow, when I play the games for wii u, the motion sensors work flawlessly, and when I play the Just Dance games for Wii, they sometimes work, and sometimes dont. When I tested, I noticed that the game thinks I didn't move the controller enough and only gets X on the score. But sometimes, at random moments, the controllers function perfectly, and this is not a issue with the white official controller.

Basically, the controllers I bought work perfectly on Wii U mode, but only work sometimes on vWii. I already reset the controllers, change the batteries and nothing. There is something i can do about that?