Quantity   Component name
1 × 2S (7.4V) LiPo protection module Available cheaply on ebay. The one I bought has P/N PCL-LiO2S6-157.
2 × NE6A931 Turnigy Nano-tech 1S 3.7V 750mAh Lipo battery that nicely fits into MIPs battery compartment. I got mine from Hobby King.
1 × Hookup wire
1 × Heatshrink