OK i think the UTG scope and red dot come with the battery , mine did .I also bought 10 more batterys for like $7 bucks on amazon . Now for the scope that is magnified . The scope has an illuminated reticle . That means when the scope is turned off You have a regular black reticle and you can turn it on and choose from red or green reticle . With the magnified scope you really don't need a battery in it to use it . It should work just like a regular scope . Unlike the red dot if its not on your just looking through some glass with no reference point .
The UTG scope comes with mounts . Most Red-Dots come with mounts and some scopes do . You will need to make sure what is what .