美国采购需求：无人机、遥控无人机、四轴飞行器、遥控四轴飞行器、GPS 无人机、遥控船

I'm looking for replacement propellers for my drone. Specifically, I need detailed information regarding their specifications, such as length and pitch, to ensure compatibility. If you have any recommendations on where I can purchase these propellers, that would be greatly appreciated. Additionally, I'm also in need of extra batteries for the drone. Any information you can provide about compatible battery options, including capacity and voltage details, would be super helpful. I'm eager to get these parts sorted out so I can keep my drone in optimal working condition. Thanks for your assistance!