i was looking at my d40 for no reason at all and took out the battery. Inside the battery compartment there are the standard 3 silver connectors for the battery but i also notice that there are also 5 gold pin holes and 2 square pin connectors. Does anybody have any idea what this could be for? I would think it would be for a battery grip to use shutter release without IR but none of the 6 or so grips have that feature, as the all seem to use IR to shutter release. So what do you think these gold contacts/pin holes are for?