Originally Posted by friendly_jacek
I thought they were supposed to last 10 years?
According to this document from Toyota, the battery should last 10 years on average:
• All Japan-built vehicles require the tire pressure warning valve/sensors to be
activated (”wake up”) during Pre-Delivery Service (PDS).
• Each tire pressure warning valve/sensor is equipped with a lithium battery that has an average life span of 10 years.
• If a tire pressure warning valve/sensor is removed from the wheel, the grommet
MUST be inspected and replaced if damaged.
As you can see in the pictures, the sensors use a regular 2450 lithium cell: