6vDC Stereo Audio Amplfier Answered

I just acquired a new, unused 6volt rechargeable battery that is rated at 12Ah. I'm looking for a Class D amplifier that'll run off said six volt battery. I've looked around but unfortunately all the amps I've found are either too low power output, or too high of voltage. I'd like to be able to get an amp that can output somewhere between five and fifteen watts stereo. Does anyone know where I could look?