Battery-free TPMS
The latest vehicles use a TPMS system without any little batteries in the sensors - it relies on the centrifugal action for energy. Do any of the aftermarket TPMS systems for trailers use this tech...
Forum Discussion
I like the external ones with the removable battery cap that take a button cell. I bet the no battery ones are expensive, probably work on the same principle as a self winding watch...
