I've never bothered. You can usually tell when a battery's on the way out, the first sign is usually decreased cranking power, especially on cold mornings.
The last battery I replaced was in my 2000 Neon. That one lasted just shy of 8 years, and I still have the OEM battery in my '08 Versa. It still seems good as new, no problems at all with cold starts. Of course, plugging in the block heater doesn't hurt.