Battery Case HDZero Rear-Mount 

The International HDZero Battery Case is a smart, universal power solution for FPV goggles that use a standard 5.5x2.1mm DC barrel input. This version ships without batteries to simplify international shipping and allow you to use any high quality 21700 Li-ion cells available in your region.

Once equipped with two 21700 cells, the Battery Case provides long runtime, USB-C charging, automatic cell balancing, and a built-in high speed Micro SD card reader for convenient DVR offloading. Integrated rear-strap clips allow the pack to mount at the back of your goggles for improved comfort and balance.

Note: No Batteries Included

Features:
- Universal 21700 Cell Support
Install any reputable 21700 Li-ion cells. Choose the capacity and brand that work best in your country. Supports standard protected or unprotected 21700 cells.
- USB-C Charging with Built-In Balancer
Charge the pack using any USB-C cable. No LiPo charger required. Internal electronics continuously balance the cells for long term safety and performance.
- High Speed Micro SD Card Reader
Includes a USB3.0 Micro SD card reader built into the battery housing. Offload DVR footage quickly at the end of the day while the battery charges. Because the SD card travels with the battery, it is difficult to forget in your computer.
- Reverse Polarity Protection
If the cells are installed backward, the Battery Case automatically disables output to protect your goggles and connected devices.
- Rear-Mount Strap Clips for Better Balance
Mounts to the rear of your goggle head strap to counterbalance the weight of the goggles. Reduces forward tilt, improves comfort, and maintains ideal antenna orientation.
- Reliable Power Delivery
More stable output than many USB-C power banks and correctly reports voltage to the goggles for accurate low voltage alarms.
- Compatible with All Major FPV Goggles
Works with any headset that uses a 5.5x2.1mm DC barrel jack, including HDZero, Walksnail, Skyzone, Orqa, and others.

Specification: 
Model: HDZ2170
Battery Support: 2x21700 Li-ion cells (user supplied)
Voltage: 6.0 to 8.4V (2S1P)
Charging: USB-C 5V3A
Cell Balancing: Continuous internal balancing
Safety: Reverse polarity protection
Micro SD Reader: USB3.0 high speed (>90 MB/s)
Power Output: 5.5x2.1mm DC barrel plug
Weight: Approx. 73g empty (depends on cell choice)
Mounting: Integrated rear head-strap clips
Compatibility: Any goggle with 5.5x2.1 mm DC barrel input including HDZero Goggle and BoxPro

Package includes:
1x HDZero Battery Case (Global version, no batteries)
Built-in USB3.0 Micro SD card reader
Integrated rear-strap mounting clips
Goggle strap shortening clips