Is it time to get new battery?

[nsense]

I have a 04 X5 4.4i w 54k miles. Bought it from my uncle last year June after he bought a Range Rover Sport. Anyways, after 3 mods to it, it still has the OEM battery and seems to be in tip top shape. The battery indicator is still green. I have a Toyota 4Runner as my work car, so I only use the X5 on weekends. This past winter, I never took it out of the garage for 3 months and the longest I havent started the car was like 8 weeks during that time. so far - No battery drain, no start up problem, and I never lock my car in my garage. Should I get new battery then? Thanks!