Is the battery secured somehow? This may end up in problems during the flight, the UAV is constantly exposed to vibrations, maneuvers and sudden loads. If the battery is not firmly fixed, it may move, and this affects not only the convenience of use, but also the safety of the device. And the risk here is not limited to the fact that the battery may simply fall. What a bad battery mount can lead to: Shifting the center of gravity Increased load on cables Damage to electrical connectors Deterioration of stability and balance Damage to the battery case in contact with frame components For reliable fixation, special clamping straps, anti-slip pads and standard holders designed for a specific platform are usually used. It is important not to exaggerate: do not squeeze the battery excessively, distort or damage its protective casing. The battery mount is not trivial, but a full-fledged design element on which the stability and safety of the entire UAV depends. Sometimes it is precisely this "inconspicuous" detail that helps prevent serious consequences. We are in TG we are in MAX.