Flashing orange light gamepad, won’t turn on

My Wii U won’t turn on and flashes orange when charging. I have tried the reset by un plugging. I have tried replacing batteries. I have 4 different batteries all the same 3 of them are brand new. Same voltage same amps same watts. I have tried unplugging the battery wires between the chassis and battery and reconnecting. I haven’t found much in this online only a few Reddit subs, and some gba subs. The only thing all of them say is the battery is bad. I checked the voltage on my battery’s which indicates 3.654 which is right in target spec so it is isn’t the battery. Who here knows how I can get this in working order again

My Wii U won’t turn on and flashes orange when charging. I have tried the reset by un plugging. I have tried replacing batteries. I have 4 different batteries all the same 3 of them are brand new. Same voltage same amps same watts. I have tried unplugging the battery wires between the chassis and battery and reconnecting. I haven’t found much in this online only a few Reddit subs, and some gba subs. The only thing all of them say is the battery is bad. I checked the voltage on my battery’s which indicates 3.654 which is right in target spec so it is isn’t the battery. Who here knows how I can get this in working order again