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The sensors you have are likely not Porsche branded, but are the same used in VW and Audi cars that use sensors.
Batteries are not replaceable, you have to replace the whole sensor.
The wife drives a GM product with similar sensors. It is a 2016, but has 114,xxx miles on it. We bought it 6 years ago, and it is unlikely the sensors were changed before we bought it. We have now changed tires twice, and two of the sensors have died. Part of me says I should replace them. Part of me says there's a tire pressure gauge in the center console. It's all up to whether you can tolerate that light. The sensors go into a very low power mode when you aren't driving, yours may be good for several years yet. If you have the ability to break the bead on the tire and get in there and replace the sensor yourself, I'd say wait. If not, and you think the next set of tires is going to last you more than 4 years, and your wife doesn't want to see the light, get them changed now.
My problem is the wife sees all the lights on the dash with the same criticality, and if I tell her to ignore the TPMS light, she'll ignore the oil pressure light and everything else on the dash. I'll get in the car and ask her about something, and it's always "oh, that just came on".
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