Originally Posted by e_lm_70
A regulator and the internal cell, have a similar weight ...
Either you use directly 5V bec from your radios gear ... or if you run on 1S .. you can get directly the power ... as well .. if you use a lipo 2S or more ... you can take 1S Lipo from the Balancer connector.
Currently looking at this 5V boost regulator for 1.5 grams:
Think that's significantly lighter than the internal LiPo.
This is for a micro quad flying on 1S. I have already tried running it from the flight cell but the camera shuts down after about 90 secs due to the voltage drop under load. A boost regulator will stop that.