Here is a 3D printed TRX4M plug to be use for an adapter cable so you can run all your other batteries using your balance jst-xh 2S battery.

There is two versions one is for servo space terminal that I had on hand and the other one is for the stock TRX4M battery terminal. Sadly I could only get the 3d printed plug to work correctly using the 0.2mm nozzle. I couldn't get it to work with the 0.4mm because the walls are too thin. I also recommend using a flexible material like PETG specially on the version of the plug for the servo terminal that I had because it makes the little angle tabs flexible and will not break like PLA. The stock adapter can be printed in whatever you want.

See my other models for a handy fixture to solder the jst-xh 2s balance port terminal. It makes life really easy.