Quote Originally Posted by GERMANIKS View Post
Yes sure you have AGM but you do not have to upgrade to AGM.
The main advantages of AGM batteries is that they can deliver high burst of power on demand (Mandatory for Start/Stop technology, which once again, your car does not have!)
Charges about 5 times faster than a normal battery.
They do not spill in case of an accident
They can be mounted in any position.

AGM batteries cost twice as much on average compared to a standard battery. Your call. No real advantage in changing to a new AGM unless your car has Start/Stop technology. You have a start/stop button, which has nothing to do with the start/stop technology.

This is Start/Stop technology by BMW here:
http://www.bmw.com/com/en/insights/t..._function.html

Your battery drain may be due to a few different things too. You may end up putting a new battery in and still have a battery drain issue. Typically on e6x/e9x/e7x cars a faulty module could cause a drain. A faulty IBS sensor in the negative lead could cause a battery drain etc.
Thanks for that Germaniks. I understand what your saying my wife's 3 series has stop start. So I can just buy a standard battery in halford's so? If I bring it to you can you register and code it for me or can they do this in Halford"s too?