Never used D&O Lighting Dtap/Ptap to Female USB.  List $49

From the manufacturer:

Highlights

• Connectors: Standard D-Tap Male Connector Protected Dual USB Ports One USB 1.0 Amp One USB 2.1 Amp
• Cable Length: 3' (1m)
• Output: 5v / Input: 8v - 22v

Battery Details

Our D-Tap to USB Power Converter creates two powered USB ports from any Gold Mount or V-Mount battery with a D-Tap male connector.

Power or charge your smartphone, iPad, tablet, camera via Case Relay Camera Power System, Case Air Wireless Tethering System, TetherBoost Pro, GoPro or Action Camera, or any USB device using this dual-port cable and a D-Tap battery.

Power Your USB Devices with Batteries on set or in-studio. Power your USB devices using batteries you already own! Utilizing the new D-Tap to USB Power Converter, you will now be able to keep your electronic devices charged while continuing to power a monitor or light using a battery with a D-Tap port connection. For videographers and filmmakers, the cable allows you to power your Sony, Nikon, Canon, Panasonic, Fuji, Olympus, and BMCC using any battery with a D-Tap connector.

Specifications

• Male D-Tap (P-Tap) Port
• Two Female USB Ports
• 3' Cable
• Color: Black
• Compatible with iPad, Tablet, iPhone, Android, Case Relay Camera Power System, Tetherboost Pro, GoPro, or action camera, any USB device that can be powered through a D-Tap. Cameras such as Sony, Nikon, Canon, Panasonic, Fuji, Olympus, and BMCC, using any battery with a D-Tap Port.

Included in Package

• 1 x D&O Lighting D-Tap connector to USB power Converter