They are not designed for high amperage draws. They are designed for holding a charge over a long period of time. If you look at the info pdf file that is online for them you will see the voltage really drops when place under a good load. They would be fine for small planes with non digital servos. One of my friends told me of one of his friends that lost his plane from a brown out from low voltage under load. No I do not know the detail of how it was determined that was the cause. I have nothing small enough that I would even think of using them in except for ignitions. As for NiMh the only ones I would consider using on the rx would be the 2/3AA size or C size. The standard AA size again are not designed for high loads.