Broz, exactly what does the rest of the circuit do, we might be able to help you design around your weight requirements. Keep in mind you're pretty much requiring that you work with SMD components. Considering it's micro RC it's going to be smarter to tap into the existing crafts power supply, it completely eliminates 3 grams of weight not to mention the space. Do you have photo's or links to your project or the craft it's going into? I've always been fascinated by micro RC stuff.