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Easy to use: this extension cord allows you to connect the cable to your charger, making it much easier to connect. Made with high quality yarn. The contact material is pure copper, ensuring a firm connection every time. Wire required for high current rechargeable batteries. Great accessory for balancing batteries while charging and checking the voltage when the balance cable is not accessible. Widely used to connect most lipo batteries, especially for RC helicopter drones, model quadcopter rechargeable Lipo battery DIY toy.