A search on the web found a company called "Dien tu dong" in Vietnam that makes connectors. Don't see this one on their site though, and trying to translate to English the page never loads. It looks similar, but is not compatible with, US Mil Spec connectors like the ones made by Amphenol. It is similar to the SA-201 connector on the Bluetti, but again, not quite the same. What is this plug connected to?