I am new into quadcopters so if this is a bad location for the battery you can use this same mount on top. It seems to me a lower center of gravity would make the quad more stable? I am still waiting for the last few parts for my drone to arrive, so I have been tinkering with ideas. My Battery kept sliding back and forth so I came up with this to hold it in place better. Hope someone can use this. It was designed around a Zippy 1.3 mAh Battery, size of battery is 70mm X 35mm X 20mm Print this with the base down so no support is needed, the tabs on each side fit tightly into the slots in the ZMR250 frame, I then wrapped it with a Velcro belt. I printed this at 100% with ABS, base down so no support is needed.