This is his first Zii. One 5000 mAh 3S or one 3000 mAh 4S battery is placed sideways at the nose.
In his second Zii, he started with a plywood battery box. He cut this himself; it's sized to hold two 4000 mAh 3S Turnigy Nano batteries.
To keep the radio components separated, he:
- moved the video transmitter all the way to the winglet
- put the RC receiver is in the center of the wing on the opposite side
- put 3DR radio close to the APM in the main compartment
He mounted the ESC above the APM.