Managed to get everything up and running with your advice - One thing I needed to do first was flash V1.0.0 as the system was running V1.0.0beta and had an older version of ESC tools V1.08.
Once V1.0.0 was flashed the ESC tools was update to 1.20 and allowed me to update to the ESC firmware version 38.
After everything flashed and updated I now have the battery information in QGroundControl!
Many thanks again for your assistance! 
@Eric-Katzfey Hello Eric
When I use px4-listener battery_status I get the response, never published.
Hello There
I am using the Voxl 2 Mini with the Mini 4 in 1 ESC, we are not getting any battery data from ESC being sent to the Flight Controller.
We have installed the firmware and parameter file via the ESC tools and are able to spin the motor in Qgroundcontrol.
Despite this we are unable to get any battery data, using voxl-inspect-battery in the adb shell we get each column for voltage, charge, current but they are reading N/A
Is there any configuration we are required to do to get this data?
Many thanks
Jack
Hi @modaltb
Thanks for your response - We would 100% be happy to test some dev builds if it provides the functionality we require!
I'm a hardware guy myself, but let me know when the builds are ready and I can let our dev team take a look.
I see in the user manual the onboard J10 SPI port can be switched to be utilized as a UART port.
The manual states NOTE: this requires a TrustZone devcfg and kernel update. Contact forum.modalai.com for inquiries.
Are there any instuctions on how to switch over to UART mode that can be provided?
Also once set up in UART mode my intention is to connect the system to an external flight controller.
Many thanks!