I am using dual 6v 1400mah NiMH batteries from hydramax in parallel. When the opertunity comes i am going to upgrade to nice sub-c Nicd but as of now the Hydramax's seem to do find. Invest in a volt checker! I also switched to the ar7000 with the 24" satelite extension. I nixed the mathboxes and am know just going direct into the ar7000 and mixing the rudder and elevator together with the DX-7. BTW, in idle up, i hover between idle and 1/4 throttle. This is with the DL50. LOL