And now the test with dual Nimh batteries. I connected 2 x 7.2v nimh 700 mAh batteries in parallel. So I should get the equivalent of 1 x 7.2 nimh 1400mAh. This setup will give my plane the same weigth as the original setup with 1 battery. We got 7000rpm that is almost the same as with the 2cell Lipo. 270 grams of thrust. Compared to the 2 cell lipo 800mAh, we have a little less thrust, have more weight, but have more battery (energie) capacity. So at normal cruising speed this setup would have longer flight time.