PP: I don't know what it is, but my controller keeps on disconnecting. It's not the batteries, because they're fully charged, It's not the controller because it did the exact same thing to me in my other controller, so I have no idea whats going on, it was perfectly fine earlier, and yesterday, and it's not like every 10 minutes, it's literally every 10 seconds. I hear a buzzing noise in my mic, and then it just stops, so that is pretty lame.
EDIT: I swapped these rechargeable batteries for the rechargeable batteries in my Wiimote, which are the exact same brand as the ones I just took out, and now my controller is fine. I guess maybe it was the batteries, I put the ones that were messed up in my Wiimote, so if it does the same to my Wiimote then that definitely means its the batteries.
Yutz, check the voltage on the label of the batteries. Then check it against the requirements on the device.
Most throwaway batteries are 1.5 volts. A lot of the rechargeables that are the same size are only 1.3 or 1.25. Basically means that the rechargeables will only last a fraction as long as the throwaways, unless you're using them in something that doesn't draw much power, like a TV remote. Also, as the rechargeables get older and hold less charge, they'll start failing faster and faster.