If you've never charged that 4.5 year old battery then yes it will start the car but, it has lost life.And it will show itself in the cold temps. The BMW car calls for a great deal of power from a battery.
My experience, I'm just learning that the ecm prioritizes the many electrical components in the car and feeds accordingly.
simple example...I've tracked that my garage door opener functions poorly on a less than fully charged battery.
Just the same with the mirrors, wipers and yes with the starter!
A poorly charged battery can and will burnout a starter prematurely. I equally suspect that goes for the spark plugs, coil packs etc...
I've learned any battery supplying a BMW car's power should be charged to the fullest once a week especially if it's 4.5 years. Newtis reports once every 6 weeks if I remember correctly. Lots of things I was not aware of concerning the battery, BMW relationship. I now place a charger on my cars every weekend. Especially, if the car had sat for over a week dormant!
I am coming to the revelation that just as fervent as we BMW owners are about choosing the oil and changing it. Just as well we need to be for changing and charging the car's battery!

See this post...
https://www.xoutpost.com/showthread.php?p=1242130

Some great comments and perspectives from others about the subject of battery/BMW relationship.

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