Im getting there , have the 15 LiPo's , I just need to attach the wires to the LEDs MCPCB pads , need to find a temp controlled hot plate and get a better soldering iron before I do anything .
the mcpcb of the 4-die led is smaller, but i could still solder wires to the pads with a regular 80-watt weller w/o hot plates just fine. your life would be easier if you find low melting point solder wire