My wife has a Nikon D3100 that I've been using to film, but the battery typically won't last through long shoots.
I've gathered from searching around that I can't charge the camera with USB, but I wondered if there's ANY way to do that. It seems at least possible that an adapter could exist that would fill in for the battery and plug into the wall, but I haven't been able to find such a thing.
Is there such a product or technique? It would be nice to not buy a second battery, I'm really hoping for a "set it and forget it" solution.