First of all
If JMJ wasn't start his poject, I start never building this CDI.
JMJ is also one of the guys who write the code for the PIC and make the Exelsheet.
Lot of others help us with all kind of solutions to finish this project positive.
Your all a part of the project, even if you only building the CDI and ask for help !

NiCad-cells have a effective Voltage of 1.2Volt, 4 cells = 4.8Volt
This Voltageregulator have a drop of =>0.5Volt, regulator needs 5Volt + 0.5Volt = 5,5Volt minium
There are cells from laptops (Lithium) who have 1.6Volt / cell, 4 cells = 6.6Volt (some powerdrop somewhere - use 7.2Volt)
I test the CDI many times and if the ocsilator runnig smooth, the CDI consummed ~0.5Amp/h - 6.5Volt

Pffff......I see 8 HV-boards, you gone use them all by your self ?

And if someone will try something, http://www.modelbouw.gompy.net/tci/