Using these T - Motor F80 PRO motors is a breeze. First, make sure they're properly installed in your Mini Quad. Check all the connections to ensure they're secure. When using, start at a low speed to test how they perform. As for the power, match it according to your flying needs. The 1900KV might be better for a more stable flight, while the 2500KV offers more speed. When it comes to maintenance, keep them clean. After each use, check for any loose parts or signs of wear. Make sure the wires aren't damaged. Store them in a dry place when not in use. Also, avoid overheating them during long - term use. If you notice any abnormal noises or performance issues, stop using them right away and check for problems.