Since I sell and fly several planes that have the RCGF 20cc engine on it, I want to chime in and state that I have 6 volt 2300 ma tenergy batteries on ALL of the RCGF engines I have installed on my planes, and I have never had any issues at all out of any of them.
I did however notice that the older RCGF ignitions at times could be troublesome, But the newer ones I am still running.
But also let it be known on the RCGF engines I sell, I now have converted them over to the Rcxel igntion.
I have 2 of the RCGF newer version ignitions I use on a test bench to run engines that I sell before shipping them and they both are using the 6 volt tenergy 2300 ma batteries.
I still have questions myself about the voltage these ignitions can take, so all I can do for now is post what I have experienced myself.
Keep this in mind, the Rcxel and RCGF ignitions all have a 2 year warranty on them.