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Thanks for your input Technic. I had a bad feeling it was the battery because the car is over 4 years old now and probably on the factory battery. Also, I started the car many times on the day of the install without taking it on a good drive so maybe it became drained in an already-weak state. I drove it 30 miles to work today so will see how it behaves on the way home and again tomorrow morning.
Some fellow members said that it might be because of the choice of grounding location which probably isn't doing a good job, so I'll have a look into that also.
I guess with the car probably having the factory battery fitted (says BMW on it, by Banner) it's a good time to change it anyway, as preventative maintenance. I had best give them a call to ask the spec of the required battery.
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