What is a declaration of conformity

Hi, I have been asked to provide a declaration of conformity for some batteries I want to sell, how do i get hold of this? Also I need to include pictures of all sides of the batteries, which is not a problem but they want an address on the product. How did people get adding an address to something that has already been made without this detail on it?

Edited by: Online Power Systems on Jan 12, 2018 11:55 AM