ni-ion

Hi to all. I have put together a 4 cell Ni-ion 3.7 trustfire batterie pack for my tricopter as per the Geek Guy. Showing all cells good etc. But when I connect to my tri I get no power. I get a correct 4 cell read out via my Turnigy Qanum Telem but that's it. Do I need to change my power output...