Mavros read second battery monitor

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Hi, i am using both battery monitors on my pixhawk as fluid flow meters and need to get the data in my ROS ecosystem. After a fair amount of research, I was not able to find a reference to a second battery status besides the one published on mavros/battery as sensor_msgs/BatteryState. But this seems to be for a single battery

Can someone please tell me that the second monitor is implemented and where to find it.....(please also tell me if this is not implemented yet)

Thanks!