See: AVID RC

AVID have introduced new charge lead cable with 4mm and 5mm bullet connectors for 2S battery packs through 12ga wire. The 610mm long cable includes gold-plated 4mm to 5mm bullets on the battery end to cover all battery types and 4mm bullets on the charging end. It comes with the popular XH 3pin balance plug, which most trim one of the plastic alignment rails with an x-acto to plug right into the charger instead of the balance port or you can use the included XH 7pin. Balance leads are 2.5″ (63.5mm) longer than the charge leads so they can easily be plugged into any charger design. The charge lead cable are designed to be color coordinated, and available in red, blue and black colors.