If your engine is sputters when throttling up. That sounds like some of your burner injector is cloged up. The ECU use volitale ram. Not backup batterys.

I have four of the 750f airstart ECU from Electrodynamics. But i don,t think its your ECU. Your setting can be off. When teaching the ECU Hight throttle 1900 to 2010 then the light stop blinking same with low throttle 1200 to 1150 then throttle cut. The ECU won't save your setting if this is not done properly