I take long timelapses, for astrophotography. My camera's batteries are irritatingly short-lifed for this purpose, and so I wanted to try an alternative. I found .stl files for 3d printing the form factor of the battery as an empty shell, and I'm pondering popping something like this inside:
This would let me connect any micro-usb power supply and step-up the voltage to the 7.4 volts the battery itself ought to supply.
Now, I'm not so hot on electronics beyond basic circuitry, so the dangers of this approach are lost on me. Obviously I'll test that it's not going to melt the printed battery case and I'll check that the output voltage is stable before giving this a try. What I want to know is; are there any non-obvious dangers to this approach? For instance, if a certain component fries on that board, is there a danger that the camera this is plugged into will be killed? (input voltage will be 5v so that seems unlikely, but I just don't know for sure).