I have a remote control for a GoPro camera. The remote runs off a 3.7 v li-ion battery. The remote draws about 100 mA.
I want to extend its usability by supplying 12 v power. The camera cable takes 12 v power then has its own converter cable that plugs into its bus port to supply 4.2 v. I have a separate power line off the 12 v that inputs to an eBay dc dc buck converter set at 4 v. I have removed the battery and the buck converter (LM2596) is soldered in its place. I removed the battery since it is no longer needed and space was an issue.
It seems to work well, however I'm wondering whether I can expect any reliability issues, or whether this is not good practice. FYI, i tried running both camera and remote off the camera converter cable but this does not work.
Thanks a lot.