I just got a Nikon ML-L3 wireless remote control. It has come with a battery installed. I have 2 questions that I hope someone can answer. (1) How do I open the battery compartment? I pulled at it a bit and it does move but I am afraid I'll just break it if I pull harder. I've never ever seen such a complex compartment for a battery before. (2) The remote works - I tested it. But the bulb at the front does not light up. Is that normal? Thanks.