Needed to get a backup TX for my 9+ (broke the momentary switch at the last comp’ which nearly grounded me for the rest of the day).
Liked the grip on my mates Q-X7 which is a great help with F3K (DLG launching ) so I got one. It has the 3 pin side port on it, but like others have seen, no info about it!
Opened up the TX and metered the connections. The pins go direct to the battery + and - . The right-most pin (looking from the front of the TX is the -ve and the left pin is the +ve. Middle pin appears to be OC, I.e. no connection, as does the middle pin of the battery connector.
My thoughts are to link the middle pins of each connector together. This will bring a LiPo/LiFe balance connection out to the external contacts This will enable balance charging of the LiPo without disconnecting it.
For interest, the external connector is a Molex 2543 3 way locking PCB connector, for those wanting to make up a special charging lead.