Don't worry about it. JST connectors can handle upwards of 15 Amps continously. If you upgrade the heli to a more powerful brushed or brushless motor, then you might consider moving to Deans Ultra, Jeti, or Astro Flight connectors which can handle much more current. See Hobby Lobby's page for a good list of connectors...

http://www.hobby-lobby.com/connectors.htm