I'm only using external battery to that black box because I like to switch out batteries rather than charge. Currently I'm using 11.1 volt lipo 1550 Mah, but I've used the jetcat 1200's that we all have lying around and I've used the 7.4 duralite and the troybuilt.

Of all I recommend the 7.4 troybuilt for the compressor. as it is 5400 mah and will last a very very long time for the compressor.