BALANCE CHARGE ADAPTER BOARD
 
From MonkeyKingRC is this extremely handy Balance Charge Adapter Board.

Plug into the output of your charger using either the XT60 or 4mm bullet connectors and charge a wide variety of batteries with different connector types.

It has the ability to charge XT90, XT60, XT30, T plug and JST in 2S, 3S, 4S, 5S and 6S.

Extremely simple, but great to have at hand in any workshop or pit box.