Deans Parallel Adapter, 2 Male to 1 Female
by RMRC

Compact adapter to connect two Deans style battery connector to single connector (parallel connector). Plugs in directly to the RMRC line of batteries.

Important: batteries should be charged to the same level before connecting. Never operate with a single battery attached as the bare pins could short out to other components. Use extreme care when connecting batteries for the same reason.