The 4.0mm Banana Plug to Tamiya Plug Adapter lets you plug a battery with a Tamiya connector to an ESC with a Redcat Racing banana plug. Redcat Racing has introduced a 4.0mm Banana Plug connector on most of its electric rc trucks starting in 2011. This adapter is designed specifically for these trucks. The Tamiya plug is a white connector that is commonly found on NiCD and some NiMH batteries.