D300 and SB-22S + DBS?

<p >I was shooting at the local stock car track the other night with my D300 and a SB-22s flash. I had three occurrences of false dead batteries using the flash. They turned the camera off and the display showed “dead batteries”.<br>

The batteries were newly charged, and when taken out and re-inserted everything worked ok, until the next time... When I got home I checked all the camera batteries and they were all fully charged, or only down a little (typical amount) from being used that night.<br>

I’ve used the SB-600 nearly every weekend for the last two weeks (also the in-camera flash) and have never had a problem. It seems more than coincidental for it to happen three times when I used the SB-22s…<br>

I was only using the SB-22s because my SB-600 blew up the other day (sounded like a .22 rifle going off!) The last thing I want to do is screw up the D300, any ideas?</p>

<p >Cheers and thanks.</p>