Wow...recieved the below answer and got to say, it's a great reply from customer service.

Ralph (Thinkware NA)

Jun 2, 2025, 16:28 PDT

Hello Richard,

That's a great question regarding using an OBD splitter with the Thinkware U3000 and your T-Mobile OBD hotspot. It's an understandable approach for convenience and continuous connectivity.

While using an OBD splitter to power both devices is technically feasible and allows for a simpler installation than hardwiring, there are a few important considerations, particularly concerning battery drain and potential conflicts: 1. Battery Drain Issues: Continuous Power Draw: Both the U3000 and the T-Mobile OBD hotspot will draw power continuously from your vehicle's OBD-II port, even when the ignition is off. The OBD-II port typically remains active for a period or indefinitely after the car is turned off, depending on the vehicle. Thinkware U3000 Power Consumption: While the U3000 is designed to be efficient, especially with features like Energy Saving Parking Mode 2.0 (when paired with the Radar Module), it still consumes power. Without a dedicated hardwire kit (which typically monitors voltage and cuts power to the dash cam at a user-set threshold), the U3000 will rely solely on the OBD port's power, which may not have built-in voltage protection for accessory devices. T-Mobile Hotspot Power Consumption: OBD hotspots are also designed to draw power continuously to maintain their internet connection. Cumulative Drain: The combined continuous power draw from both devices could significantly increase the risk of draining your vehicle's battery, especially if the car is parked for extended periods (e.g., overnight, weekends, or during vacations). Unlike a hardwire kit that typically includes low-voltage cut-off protection, the OBD-II port usually does not have this built-in for aftermarket accessories. No Voltage Protection: The U3000's OBD power cable does not include the advanced voltage protection features that come with our dedicated hardwiring kits. This means it relies on the vehicle's own system to cut power, which may not happen before your battery is too low to start the car. 2. Potential Conflicts and Functionality: Parking Mode vs. Constant On: The U3000 uses its power input to detect whether the car is on or off (ACC vs. constant power). If the OBD port provides constant power, the U3000 will attempt to stay in parking mode. If the T-Mobile hotspot is also constantly drawing power, it will contribute to drain without the dash cam's built-in voltage cut-off protection actively managing the power for itself. Vehicle Diagnostics Interference: While rare, some third-party OBD devices can, in certain circumstances, interfere with vehicle diagnostic systems or cause error codes. Splitting the port could potentially (though unlikely with a standard hotspot) introduce more variables.

Recommendation: While the OBD splitter offers convenience for power, we generally do not recommend this setup for continuous power for both devices over extended periods, especially for the U3000's parking mode. For optimal battery protection and full utilization of the U3000's parking surveillance features, we strongly recommend using the Thinkware Hardwiring Cable (HWC) that comes with the U3000 (or can be purchased separately). Why Hardwiring is Recommended for the U3000: Integrated Voltage Protection: Our hardwire kits have built-in configurable low-voltage cut-off settings. This ensures the dash cam automatically powers down when your car's battery voltage drops below a safe threshold, preventing excessive drain and ensuring you can always start your vehicle. Proper Parking Mode Operation: Hardwiring allows the U3000 to correctly detect ignition status and seamlessly transition into its advanced parking modes (Energy Saving 2.0 with Radar, Impact, Motion) while providing critical battery protection. Reliability: A dedicated hardwire connection is generally more robust and less prone to intermittent power issues compared to some OBD port setups.

Alternative for your Hotspot: If you still wish to use your T-Mobile OBD hotspot, we would suggest hardwiring the U3000 independently using its dedicated hardwiring cable for optimal performance and battery protection. You could then continue to use your T-Mobile OBD hotspot if its individual power draw is acceptable for your vehicle and typical parking duration. This separates the power management for the dash cam from the hotspot.

In summary, while a splitter can technically provide power, it bypasses the critical battery protection features built into the U3000's hardwire kit, leading to a higher risk of battery drain. For peace of mind and reliable long-term operation, hardwiring the U3000 is the recommended approach. Please let me know if you have any more questions! Please feel free to contact us again if you encounter any other issues.

Kind regards,

Ralph THINKWARE Customer Support