The G6 battery is rechargable, but its lifetime is currently indeterminant. As of now, there is no reason to go out of your way to charge the battery via USB dock as normal use is sufficient for charging. Then again, the battery should have enough life on its own to not require charging for an extended period of time (whether extended means 1+ yrs is hard to say). Also, the G6 Touchpod menu battery display is not of the internal G6 battery, but rather the DS's battery. I hope this clears up a few things. edit: new evidence, my crackpot theory was originally incorrect.