Colin,

On my set up I use dual batteries on my Axiome and Osmose Evo.

CDI with 19x11 APC ignition, consumption is 76mAh per 13min flight (P11), I'm using a duralite reg with TP 900mAh, you can get at least 6 flights with it, then the engine will misfire once in a while but will keep going.
Rx JR R921, 2 9411,2 3421, 1 8611, 1 HS82MG(hitec) it consumes 137mAh per flight like, I'm using TP1350 and FlightPower1350, this using the Powersystems Digiswitch.

As a note, I do land with at least 2 minutes of fuel, and do not fly at less than 50% charge on the batteries, so in my opinion with those batteries you can get 5 flights worry free.

Hope it helps