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laptop_battery.py has evolved over time, as laptop vendors and driver developers don't follow any sort of standard for how they expose those stats. If you aren't using an official turtlebot laptop from either iHeartEngineering or Clearpath Robotics, chances are that your specific laptop isn't exactly supported. I would suggest posting a ticket on github.com/turtlebot with as much details as you have about the layout of your ACPI -- and of course, if you do get around to fixing it, please submit a pull request with your changes!