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Yeah Racing has released a 4mm High Current Connector Set (BananaPlug) which compatible with most of the banana plug battery for RC.
Features:
(1) Made in high quality BRASS which reduce electrical resistance and enhance conductivity.
(2) Single-piece design offers 60% more of connection surface thanregular plug, and minimize over-heat issue from bad connection
(3) Connector in size 4mm which is compatible with most common banana plug battery Specification:
Male Connector Diameter: 4mm
Male Connector Length: 19.5mm
Female Connector Diameter: 4mm
Female Connector Length: 20.5mm
Source: yeahracing
Where to buy ? http://www.rcmart.com/catalog/advanced_search_result.php?keywords=+4mm+High+Current+Connector+Set+%28Banana+Plug%29