Tried to find out more about IndiPro. Looks like they are just selling rebranded stuff. Their tripods look exactly like the CamGear tripods (who are the actual manufacturers).
So very likely the support you contacted has no idea what they are talking about as they don’t produce those battery plates, or batteries and have no electronics expertise.
Just have a look at the reviews on Amazon for example here:
https://www.amazon.com/-/de/dp/B078YB36YX/Also those battery plates without any voltage conversion are no rocket science. It’s just some wires and contacts. Very likely the manufacturing wasn’t either not precise enough and leaves too much play, or the wiring is loose or incomplete or the soldering bad.