It's an esc connector, so you have three of them which pull way less amps than a battery connector, you are unlikely to have any issues with a small amp draw system like this. I have trimmed wires to fit in connectors before and never had an issue, especially with ESC connectors because they draw less amps than the two larger battery wires. Remember the ESC wires dont supply constant amps and volts to the motor they provide a 3 phase pulse where the battery wires pull constant amps and volts, so most smaller esc's (60 amps or less) connectors are overkill anyway and trimming a little of the wire to fit is no issue as long as you get a good solder joint. Now, that being said, I wouldn't do that for a 100 amp or larger system... I have also trimmed battery wires to fit into XT60 connectors and never had an issue and fly my planes hard...