Which exact model is ‘Micro JST’?
I am unable to locate it on the JST site: JST Product Selection Guide
None of their 1.25mm connectors looks like the one on the Heltec board.
I think that the Heltect board uses a Molex PicoBlade Header:
1.25mm Pitch PicoBlade Header, Surface Mount, Right Angle, 2 Circuits
Cables Assemblies:
PicoBlade-to-PicoBlade Off-the-Shelf (OTS) Cable Assembly, Single Row, 2 Circuits
