The Ctek 7002 has a reconditioning mode. I would wait and use that instead for the old battery. I've done it and it works great.
And one of these mounted under the hood tells you when to do a maintenance charge and it has a plug for the CTek.
Taz... My favorite BMW so far.
Sport, Cold weather, Logic 7
19" Miro M6 Wheels w/competition stems
MGP Claiper Covers (BMW)
Dension Gateway 500 and Audio Video Router
AC Schnitzer pedals
Carbon Fiber Di-Noc Trim
5W White Angel Eyes