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Upgrade Diffirecence:New Motor Version Support Flight in 4S Lipo Battery with 2.5 Inch Prop very well.( Old 1104 Motor Version support 3S Lipo well and support 4S with 2 Inch Prop well, now new 4S 2.5 inch very well)For New Motor Version, recommend 4S 450-650mAh Lipo ( with 2.5 Inch Prop); 3S 450mAh..