Yeah Racing has released a 4mm High Current Connector Set (Banana Plug) which compatible with most of the banana plug battery for RC.
(1) Made in high quality BRASS which reduce electrical resistance and enhance conductivity.
(2) Single-piece design offers 60% more of connection surface than regular plug, and minimize over-heat issue from bad connection
(3) Connector in size 4mm which is compatible with most common banana plug battery
Male Connector Diameter: 4mm
Male Connector Length: 19.5mm
Female Connector Diameter: 4mm
Female Connector Length: 20.5mm