Thank you very much! I tried to connect it to a 5V source, and you were right - it just worked fine! http://i.imgur.com/u4hAsHg.jpg To help anybody with the same board - my setup in the picture above is: 3.7V 2200mAh Battery Battery Charger Power Boost 500 (Boost your 3.7V to 5V) Connect the red an...