Is it time to get new battery?

[BMWvoid]

My X5 is just over 4 years old now. I have all the service done at my dealership since it is a CPO and I purchased the maintenance package. I just hit 30K miles and had one of the inspections completed in early April. I have the OEM battery. At that time I told my service advisor that I want to replace the battery. I was quoted $475 with labor. I was fine with that. I just wanted it done. My advisor called me and said they would replace the battery, but he wanted me to know that it was really not necessary. His recommendation was to wait at least another two years, unless I started to experience problems. So, I decided to wait.