Hi Peter,
I was glad to help you. I have some comments about your Instructables:
1) In your Instructabe step #3, you say to test the LED across the battery and solar cell that are in series. Nothing will limit the current and the LED will burn out if the solar cell is in full sunlight at noon on the equator. The 3V solar cell will produce its rated 150mA and the total voltage is 4.2V. The 3.6V LED has an absolute max current rating of only 30mA so a current-limiting resistor should be in series with it, or shade most of the solar panel.
2) Ni-MH cells last much longer if they are not overcharged. Energizer recommends stopping the charging at full charge, or using a trickle charge current of only the capacity divided by 40, not divided by only ten.