<p>Hi Dietrich,<br>
I had a 150HS until yesterday (just sold it, but I was testing it) and mine uses 4AA batteries, two in each of two compartments on the back of the camera. <br>
In each compartment, the batteries were placed facing opposite ways. If I recall, the first battery in is with the + pole (the "nub") facing downward towards the bottom of the camera. The second battery in is facing with the + pole upwards (towards the viewfinder.)<br>
The other compartment was loaded the same way.<br>
If that doesn't work for you, then I probably have the poles reversed. That's easy to test, of course. </p>
<p>Jeff</p>