This RC glider originally comes with 2 small 615 coreless motors, which are pretty weak. In order for it to use a larger and heavy battery I upgraded it with 2 x 720 motors, and relocated one 615 motor to the back (and have it powered by the LED power source so it is in an always-on state).
Now it flies much faster and can still sustain a heavier 500mah cell.
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