High quality, high strand count silicone wire used gives higher amp throughput than standard wire of the same diameter. Connectors are plated for greater amp handling.
If you find it difficult to solder your own connectors, don't own a crimping set or are simply looking for a quick way to switch your current batteries connectors - these female JST pigtails are perfect.
Please remember that if you're buying this to change your batteries connectors, make sure you cut the wires ONE at a time! Cutting across both at the same time will complete the circuit!