After watching your video, I have done this successfully. I have added two lithium ion 4 volt batteries. And I didn’t separate those original batteries from the battery case. I have added 4 wires from those connection and added parallel line to two extra batteries and It's working properly. Now I can even charge those extra batteries using the original battery. 😄 Thank you so much for your video.

I am using battery bank by taking out the cables from the camera

Jnab agr is k sath light ki battry lga di jay woltage same ha sirf ampair zayada ha 3200mh ki battery ha kia is ka koi problem to ni ho ga