Use any 12-volt power supply or 3s lithium battery with a female end XT60 to power anything you would plug into your cars accessory port. 

Cell phone and laptop chargers, power inverters etc. With a 3s lithium battery like a 3s LIPO you can make automotive accessories mobile.

I for instance use mine to run a portable air compressor.

***Please note that many batteries associated with robotics and radio controlled hobbies have a nominal voltage much higher than 14.4 volts (the fully charged voltage of your lead-acid car battery and thus what manufactures of 12-volt accessories plan on being the high end of experienced voltage range) just because your battery has an XT60 that will plug into this adapter doesn't automatically mean it's safe for your devices. Any battery with a voltage above 14.4 volts should only be used with this adapter alongside a buck converter (DC to DC converter bringing down voltage) like the one I offer. This shop bears no responsibility for you damaging your devices or equipment by user error.***