Hi Abdullah,
I was in a similar situation with a need for remote power.
This is the solution I went for
50ah agm battery which I consider will give me enough power to run a mount, camera and dew heaters for a night.
A battery box with cig lighter socket, USB and anderson plug for connections.
I found that when imaging I was using just under 2 amps of power. That would be about 12 hours considering you don't want to run your battery down to less than 50% of its capacity.
https://www.ebay.com.au/itm/143345238099
https://www.ebay.com.au/itm/293955000619
cheers
Rob