sorry i seen the title and thought you new my ex wife

BM,

You can drive ta whole 30% plane, servos and ignition, with one 2300mah A123 with 3 leads. You can make this yourself or buy them made that way from retailers like NOBS.

With a DLE 50/55 you really only need a 16oz at most. (Saves weight and space for smoke oil!) On my 30% Yak55 I use a Sullivan Skywriter and drive it with a small 250mah 2cel 7.4 volt lipo battery and usually have plenty for the entire weekend.

Good Luck,

Ed

Oh and on the switches I use two standard HD Charge port swithces to the RX and one to the Ignition with a inline step down diode to keep the voltage under 6volts to the ignition. Other than that there is no need for any Regs and stuff ...