Auxiliary Battery Power Supply Plus USB Cable for Zoom Q2n and Q2n-4K Handy Video Recorders : 

Auxiliary Battery Power Supply for Your Zoom Q2n or Q2n-4K

Extend the life and performance of your Q2n/Q2n-4K Handy Video Recorder with the Zoom BCQ-2N battery case from here. Just pop in four AA batteries and mount this power supply to your cam's hot shoe mount to enjoy extended shoots and recording sessions — all without wires. A tiny Micro-USB cable is included to keep your setup nice and tight. Don't get caught unprepared out on location. Throw the BCQ-2N battery case in your camera bag and enjoy extended performance, even on the go.

Zoom BCQ-2N Battery Case Features:

• Self-mounted wireless battery supply
• Mounts directly to your Zoom Q2n and Q2n-4K
• Extends life and performance on the go
• Great for extended shoots and recording sessions
• Powered by 4 AA batteries — sold separately
• Includes a tiny USB cable to keep setups tidy
• On/Off switch preserves battery life for periods of unuse
• Zoom part #: ZBCQ2N