Originally Posted by kf4mot
The lighter weight may get you a little more flight time depending on your throttle management. If you fly WOT the whole flight the lighter weight won't give you any more time.
I'm now considering the 450mAh one for the (significantly) lighter weight. I'm happy with the flight times I get with my 350mAh, so I'll aim for decreased weight overall.
WOT=without throttle? hmm