I’ve purchased [this camera. It come with a power adapter for a standard 9v battery. I would like to create a longer lasting power supply. Does anyone have any advice? Would it be possible to use LiPOs?](2.4GHz Wireless NTSC Outdoor Camera - WRL-09189 - SparkFun Electronics)
i don’t see why you couldn’t use LiPOs, but they are 3.7v - best to use a switching regulator circuit to get it up to the 9v you need.
anyone with more experience in these things feel free to correct me! 
a heavy alternative would be 6x 1.5v AA cells, giving 9 volts. AAs have a much larger capacity than your average ‘9v cell’.
I also have a question for all, regarding this camera. I had a similar device a few years back on which the signal drifted over time, to the point where it would drift out of the receiver’s range - the frequency adjustment knob on the receiver would go no further and the signal was lost.
Does anyone know if this camera suffers the same fate? Or was it perhaps a dud or bad batteries or some other fault I had last time?
Thanks for the reply.
I haven’t had any problems with my camera that sound similar to what cmetom described. But I haven’t had it very long or used it very much.
The LiPO option with the switching regulator sounds like it might be good. Can anyone possibly tell me more about switching regulators? I’ve never used one and I don’t really know anything about them.
Does anyone know if I need to be concerned with amperage supplied by the LiPOs versus that required by the camera. I can’t find any references to the cameras amperage requirements. Does that mean that it shouldn’t be an issue?
Another reason I’m interested in the LiPOs is because I would like to consolidate my project’s power source into one battery. I’m creating a RC vehicle using an Arduino clone for logic, one of SparkFun’s Blue SMiRF Blue Tooth modems, and the wireless camera mounted to the front of the vehicle.
In another post, someone cautioned me against using a single power supply for the Arduino and the DC motors driving the wheels, saying it would introduce noise into the Arduino. I don’t really understand this concept well. Does noise refer to erratic fluctuations in voltage (or is it current)? Does anyone have any suggestions how I might overcome this? Could I use capacitors to smooth the spikes?