I'm the useing the Nades Electronics FADEC. It also depends on the fuel pump being used (I'm useing a Behotec fuel pump

which could use a 5 cell battery) I might be able to use the 4 cell on my pump but I havent explored the option because I need the nose weight.

I have a JJ1200 with Semi Auto Start I also use a battery operated leaf blower it provides a easy safe start.