[victory]

The Tiny Audio Amplifier kit bases on LM386 is a good choice for battery operation.

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Circuit Diagram

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Inputs – Outputs configuration

Parts

Specifications:

• Power supply – 6 – 12 VDC
• Output power – 1 W, 8 Ohm
• The quiescent power drain is only 24 mW when operating from 6 VDC
• Self-centering output quiescent voltage
• Onboard PRESET to adjust volume
• Terminal pins for connecting power supply, audio signal and speaker
• Power-On LED indicator
• ON/OFF PCB mounted slide switch for power supply
• Four mounting holes of 3.2 mm each
• PCB dimensions 44 mm x 44 mm

Photo:

 

[drtebi]

Not sure what the question is (is there one?).

I also think that you may want to move this thread into the DIY section.

Nevertheless, looks like an interesting project. Where can one find the PCB though?