While using a battery grip with your DSLR or mirrorless camera, you will not be able to power the camera with the FOCUS monitor. The faux battery adapter cable used to supply the camera with power is designed to fit the single battery slot that’s native to each camera body. If you like using battery grips, our suggestion is to continue using the grip to power the camera and use a Sony L Series battery to power the FOCUS monitor.

FOCUS Firmware Update Instructions

CAUTION: Make sure you do not lose power during firmware update

1. Download the latest .bin file version 3.3.2  

2. Drag and drop .bin file from download onto your SD card (Must be 16gb or smaller – FAT or FAT32 for Windows, MS-DOS (FAT) for Mac) 

3. Remove SD Card from computer or card reader attached to computer 

4. Insert SD card into your SmallHD FOCUS monitor 

5. Turn on your monitor 

6. Swipe left to right on your FOCUS all the way to the monitor’s Settings Menu 

7. Tap firmware update in Settings Menu and follow on-screen prompts 

8. Once the firmware is installed and the on-screen prompts tell you to reboot your monitor – Hold down the power button for at least 5 seconds and then release.

9. Press the power button again to begin operating your FOCUS monitor with the new firmware installed.

The barrel connector for the power output on the FOCUS monitors is a 3.5mmDia Barrel Jack and accepts a 1.1mmDia Center-Pin.
Pin 1 is Ground. Pin 2 is +DC. *Pin 1 is closest to the red dot on the LEMO connector.    
You need to be careful when attaching a third party power source to your 502 monitor. It has an input range of 6.2V to 8.4V if you exceed 10v you can damage your monitor.   Here is a good dtap to lp-e6 option that you can use with your 502 monitor:
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