I got my module and am now planning the installation.

I'm still undecided on a single (ignition + rx) vs dedicated ignition battery. If 2 batteries are used what would be the appropriate sizes for 5 flights? Or more directly, what's the rx consumption and ignition consumption per flight? I'm guessing that rx consumption should be a bit lower than non-CDI engines.

I worked out (and I guess this is old news) that I'll add 3.8 oz for the module, 0.5 oz for a switch and about 0.4 oz to re-balance the plane for a total of 4.7 oz.

Alternatively, a seperate TP 2S 900 pack and switched regulator with the ignition module adds a total of 6.25 oz. If however, I can reduce my existing 2000mAhr rx pack to 1320mAhr the total comes down to 5.25 oz.

So is 1320 enough with a safe margin for 5 flights?

Colin.