I remember seeing 800mA being drawn from a C size 2300 NiCD. Results will vary. If you're going to use one driver with four leads... good luck. Remember that long leads don't work well with glow drivers unless the source is quite large or enhanced through electronics.
It seems to me that having a C or Sub-C cell in each pod and a simple switch actuated by the pods throttle servo would work best. I would think a cell having at least 1500mAH capacity would work for each plug (I would go higher.)