I have had two msi motherboards, a k8n neo2 Platinum and now a k8n diamond sli.
both have been exceptional boards! i have never heard of any such a problem so i wouldnt recommend cancelling your order.
looks a goood board that you've ordered- pci-e, 939, sata...
if you've been researching a lot about it then its inevitable your going to find something bad, but a few batteries dying (which is simple + cheap to replace!) out of the thousands of boards they sell is nothing really.
Hope you like it, what are you planning to run on it?