3 weeks before I got the low battery message, my truck was parked in a parking lot at one end of a football field (facing the football field), and I was just beyond the opposite end of the football field, and the remote was still working. So the range then was a little over 100 yards.

 

40 months later, I get the "replace key battery" once again. Battery voltages are 3.007V, and 3.009V

 

Just had to do this over the weekend on my 2020 key fob

Grabbed these off Amazon no issue so far.

 

Mine uses the CR2025

 

Voltage on the cell after it is removed is not the same as the voltage under load. Lithium cells are particularly good examples of this.

 

This is true with any battery.

 

I just passed 48 months on my original fob battery.

 

Yes but more so with lithium coin cells than others.

If the fob doesn’t work, replace cell. If it does work then old cell was bad. If it still doesn’t work then new cell may be bad, or it may be good. Try yet another cell from another source.

If open circuit voltage low then cell is bad. If reasonable then it might be good or bad.

 

Key Fob was still working, but I was getting a message that the "key battery was low"

 

Ok, there you have it. The fob noted low voltage under load.