My friend bought a digital camera that can take pictures and videos as well. But he tell that it have restrictions is available not long the battery runs out. He did use an external battery, but the size 5 volts not had to modify the battery lead acid 12 volts reduced pressure down to the 5 volts.
OR other case. If you want the power supply for digital circuit testing or use. It’s like if you have voltage 5 volt 3amp power supply 12V directly from the battery, then it must have a lower voltage to 5V and a current sufficient. I would recommend this circuit. The principle was simple looking device for sure.