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Battery report: almost 4 years
on July 13, 2014
Battery started showing end-of-life at 3 years 7 months. This was with frequent wear but very little use of backlight or alarm.
As an experiment, after the battery started showing weakness (when the backlight was activated, the display would fade) did not replace it right away. Wanted to see how long it would go on with a very low battery.
One month later, watch still keeping time with legible display except when backlight activated. Even though the display will completely blank out now, it continues to maintain time. This is good to know if you're on a trip or something and you start getting low-battery fadeout that it won't stop working that quickly.
Casio website rates battery at 2 years, but that's with more frequent use of backlight and alarm than I did.
Update: Complete battery failure mid-August. So, total battery life in this case was 3 years 9 months, with 2 months of "warning" from earliest noticed low-power to complete failure.