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Tire Review says [0]

> the sensors are usually powered by 3-volt lithium ion batteries, but some use 1.25-volt nickel metal hydride batteries. There are developments underway that promise battery-less sensors in the future, having the potential to dramatically change TPMS markets.

Also, YouTube has a number of videos on how to change out the batteries

[0] https://www.tirereview.com/changing-tpms-sensor-batteries/



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