That connector is called 4mm HXT connector. Here's an adapter to XT60 -
http://www.hobbyking.com/hobbyking/s...dProduct=16373
I don't see one that converts to what HK would call a 'T' plug.
Most cut them off and solder they preferred connector anyway.
Check the lipo's voltage before you do that. Soon as you change the connector, its not returnable.