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Battery Lockdown The Pure-Tech products come in many different sizes and types. All of them work very well and add a clean look and to the finished setup. Here are both types of hold-down Velcro; the flat black piece on the bottom prevents the battery from shifting and the red strap ensures it doesn't move during hard 3D maneuvers. QUESTION: I have seen a number of ways to secure your battery inside an aircraft. Methods...