I found this on the
TST FAQ web page.
Quote:
quote: How long do the sensor batteries last?
On average the 510 sensor batteries last between 5 and 7 years and the 507 batteries are intended to be changed approximately every 10-12 months. The sensors stop transmitting after being disconnected from the tires. If you park your commercial vehicle for extended periods of time or if you store an RV for the winter, you can remove the sensors and extend battery life. The included battery life estimate is based upon full time use.
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The Allen wrench screw keeps honest people honest. With my install I also have to pull the tires off to access the Allen wrench head from the back of the tire so it is an additional issue a thief has to work around.
Safe Travels.