I also am starting to experience this frustrating issue. I have approx 4200 shutter releases to date and I get a low battery warning about 20% of the time. It occurs either with my 80-400mm VR or my Micro 105mm VR. I brought it to the Nikon service centre in Montreal where they were not able to reproduce the problem. They indicated that they suspected that VR was part of the problem as it draws power from the battery. I am not convinced. Anyhow, they cleaned the contacts and returned the camera. I hope that this will fix it. I'll post a follow-up either way as soon as I have new data to contribute.
Nikon D300 Issues
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