I have the TST 507 system. I don't know if this is the same for other systems, but with TST, the sensor battery is only being used when the sensor is attached to the tire. When traveling, I leave the sensors on all the time, but when I get home, I take them off. With that being said, ours lasted @ 5 years.
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Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
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