What you will require:
1. A portable radio, AM/FM or DAB, (2AA or 3AA battery type).
2. One 4 or 4.5v 80 mA solar panel from a Solar Light.
3. ideally a BAT43 Schottky diode or Silicone IN4001 (more voltage loss)
4. soldering iron, solder and red and black cable 6" lengths.
5. 2 or 3 NiMh rechargeable batteries (NiCd are ok but not as good) minimum capacity 800 mAh per battery.
Optional - heat shrink sleeving, adhesive foam strip
This is a very quick project, that can be made in about 2 hours.