I have an old Sanyo Xacti video camera which I use very rarely. Therefore every time I need the camera the battery is empty. Since I use the camera mostly at home I built a dummy battery for the camera. This post is not meant as instruction but as suggestion how it could be done.
The camera is primed to be used with a dummy battery. See that curved notch on the bottom left of the battery compartment. and the “3.7/5V” label.
I cut a strip of wood to the size of the original battery. Then ground a notch for the cable and the contacts and drilled holes to secure the cable in place. I used adhesive copper foil for the contacts and soldered them to the cable.