SmartThings Presence Sensors hooked to Car battery?

[ero4444 (Eric)]

no issues with 5vdc.

Chopping up a car adapter mini-USB charger is cheap if you already have them.

Has anyone supplied wired power to a presence fob?

So clearly the battery on the presence chip isn’t great, but I do think it’ll play a valuable role in my setup, especially considering phone tracking is all wonky for me. Has anyone attempted to hard wire a different power source to the guts of the chip? Portability isn’t a concern as I’m considering it more for glove box use. Ideally i could run a 12v line from the car into the glove and lower the signal to whatever input this contraption wants. Or for constant power supply, I could hook it up to a much larger battery and throw it in the glove box. Anyone attempted anything like this?

FYI the power locks are powered at all times.