I bought the 2 pin cable for my battery extender, because I have a phantom 2 battery. But the charger for my Phantom 2 Battery does not fit the 2 pin cable, so I cannot run the osmo off a DC source, which could allow me to live stream a night club event for example. Do I have to buy the Phantom 3 or 4 charger, or can I use a universal charger with adjustable power output?

i have the inspire battery charger that works, also the p3 works, not sure about the p4 but I think it will work.

Hello.
Unfortunately, the External Battery Extender is not compatible with the Phantom 2 charger or battery, for more accurate information, please visit the official online store: http://www.dji.com/product/osmo/info#downloads

For any other issue, please contact us freely.
Thanks.