Do not charge your laptop using the +12V system in your vehicle, it can damage either your laptop USB port and/or MaxxECU USB port.
"Don't be a dickhead, don't charge your laptop thru the car charger port." , Magnus Fernlund, Sweden.
•Lenovo Thinkpad L440 - Only use the USB 3.0 port since the 2.0 ports seems to cause communication issues.
•Katana GF66 11UE MSI laptop - unable to communicate with a MaxxECU.
•ASUS - 14.0" Laptop - Intel Celeron N4500 - 4GB Memory - 128GB eMMC - Star Black (Model:E410KA-TB.CL4128BK SKU:6498803). - unable to communicate with a MaxxECU.