the only issue I can see is weight. My guess is that the 900mah battery will be quite heavier than the 270mah.

What motor/gear box/prop combination are you thinking about using? I have my eye on one of their laser cut 24" span models, but I have not yet begun the research into a power system. Ideally I would like to use a brushless set up with a lipo battery pack; any suggestion?


Regards
Jaime.