Two things I did make sure of.

Battery ALWAYS charged before use. Regardless of how short the flight, or the run. And again always after about 6-8 failed starts during testing or setup.

Gas parameters set to the absolute minimum required to get consistent light-ups. As a result I can usually get minimum 4 starts on one fill of gas. In effect very low setting.

All it has to do is lift the temp at the probe to 120 C and if the RPM is in excess of 8K then ramping should occur. Main reason why the battery has to be spot on. If the 8K isn't achieved then a failed start is highly likely.

Add to all of this the ECU threshold being set too high, and the voltage dipping into the ECU LO area, and all sorts of things can happen.

The ECU battery is really only hammered during the start sequence. After that it runs the pump and the electronics which take very little out of it. The ECU threshold can then be set at a sensible setting which will allow the starter to operate without pulling the volts down too far.

Excuse me if I am going over old ground here, but it is what I have had to do for the last couple of years to ensure a peaceful life.

Maybe someone out there will gain something from it

Best regards

Ian