The battery discharge curve isn't exactly linear but you can still roughly estimate the remaining charge in percent. This screen will be on the robot so you can get an idea without looking at the UI. To show telemetry on the dashboard I'll need to add a voltage divider and an ADC. It'll send data via I2C to the rpi where there will be some simple math to calculate the percentage by voltage and send the data to a ros2 topic. From there dashboards or control plane can read it.
