I want to keep a device in
always on situation in the car.
I do not want the device to drain the car battery.
The car is used at least once in two days and the current consumption of my device is not that huge < 500mA .
I plan to keep the OBD port's
+12V disconnected, connect the
OBD GND to my device's
GND and the data lines to my device then power my device with an external battery. . I will use the 12v DC output of it.
Example of an external battery : https://www.amazon.de/dp/B07P6V7SZH/ref=sr_1_19?keywords=power+akku+generator&qid=1581438260&sr=8-19
Wire the external battery such that it's
+ line connects my device and
- line connects to the
OBD GND which is now shared with my device's
Do you see any issues with that wiring ?
Thank you very much.