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Solar power not working? Answered

First of all thanks for a great tutorial. I really enjoyed this tutorial (my first project) but when I made it to the end my battery was not charging. I tried an alternative 5V power source (adapter for my router), and it worked well (small LEDs on the board light up).
I have measured the output voltage of the solar panel and it seems okay (5-6V under a lamp) but nothing lights up on the board.
I have attached an image of the result and would like to know if I missed something obvious that can get the battery up and running?

Thanks in advance.