DPS 8000 not working on Nikon Coolpix 900
I have a Nikon Coolpix 900. I just bought a DPS 8000 battery pack (6V, 2700mAh NiMH). I charged the battery pack for 8 hours. When I plugged it into my camera, the camera would not turn on.
Why doesn't the DPS 8000 work like the AC adapter? Does it require 4 alkalines in the camera before it will work? If so, why is that?