EL14 and EL15 Dummy Battery Compatible with D3100,D3200,D5100,D5200,P7000,P7100,P7700,D7800 (EN-EL14).

This works well on my Nikon.I only needed the dummy battery to run from an 8.4V power bank, not an AC power supply.I cut off the proprietary Nikon plug ( kept it ) and attached a 5.1mm barrel connector that goes straight in to the power bank - making sure to have the correct polarity.Inner wires are color coded correctly - but I checked with a multimeter anyway !. Didn't need to buy the whole shebang just to get an EN EL14 dummy with a barrel end.