Does anybody know what size is the charging plug on this TX? I want to charge the batt(NIMH) without having to pull it out every time,thanks in advance.

I have a 5.5mm x 2.1mm. +/-
A 5mm x 2.1mm works as well.

Radioshack catalog #: 274-1569
http://www.radioshack.com/product/in...ductId=2103614

The MX3fg & the MX-Sport are the same...
It is Larger than the newer 6volt transmitters (MX3X & MT4)

The cheep option is to sometimes stop at a thrift store, GoodWill, or St.Vincent find a power pack for $1 to $1.50 & chop the cord off & add connectors.

thanks for the info,I'm going to Radio Shack tomorrow to pick up a pair.