Problem with the Finevu CR-300HD internal battery

Is there a way to identify the LiPo battery 3-wire plug head size? I'd like to add an extension cable like tcc's, so that I can replace my FineVu's battery more easily, and ideally not drill holes. But I'm having trouble identifying the proper 3 wire plug head size- tried buying one off amazon that turned out to be way too large. Thanks in advance for the help.
 
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