Which watch battery does the Tag Kirium CL111A use?

Contact manufacturer they will help. :-)

You probably have a screw down crown. Turn the crown counterclockwise and unscrew the crown. Now you should be able to pull it out. When tightening it back down, don't over tighten, just snug. This is to keep moisture out of your watch. Always have it screwed down unless you are setting the watch.

"EOL" means "End of Life." The battery needs to be replaced soon. I agree with other post. . . if you had the battery replaced recently, it was bad. I have had my Tag Kirium Formula One for 12 years and have only replaced the battery once.

The battery for CL111A-0 is CR2320.

I have it in PDF file
if you still need it let me know

Check the battery

My previous Kirium F1 had this problem as well.. got it fixed by my watchmaker for a nominal fee (<USD40). Apparently, the push connector needed to be repaired. After the repair, it was "clicking" again and worked fine. However, the watchmaker did warn against pushing the buttons too hard. This is apparently a common problem for this model.

Is the digital display blinking? If it is, it would mean that the battery is weak and thus, the backlight won't work.

Don't assume the battery you installed is good. Check it or replace with another.

Best place that I have found:

http://www.watchbands.com/category.aspx,,categoryID,,25