This is a Reedy 4S 5mm Pro Charge Lead, perfect for 4S batteries that feature 5mm sockets and integrated balance connector such as Reedy's Zappers SG3. Reedy's Pro Charge Leads are now available in a variety of configurations for most batteries used in popular 1/10 and 1/8 applications. Heavy-duty 12-gauge silicone wires provide maximum current flow without overheating during high-current cycling. Mesh sheathing offers additional protection and a professional appearance while positive ends are clearly marked to prevent reverse polarity.