"I know that the LT battery is heavier and may put the SE or the Atom over 250 grams, which is a legal issue if you are in the US and don't have a part 107 license."
This might answer your questions about legality, and drones...
https://www.faa.gov/uas
At the top right hand side of this thread, click on the avatar that is your profile. Then click on Account Details from the drop down. Then click on the Avatar and load your footprint.jpg file from using the browse feature, or drag and drop the image as instructed. Then click ok and your Avatar...
This one is an extension for the original male to male with angle connector. Angle connector goes in the Tab A. The other male end goes into the female connector of the extension cable. The male end of the extension cable goes into the controller. I read of some issues of not using the original...
Welcome to the fun. If I may suggest, take a look at the Potensic Atom 3-Axis model. I'm sure you would enjoy it, and you won't grow out of it too quickly. Number one piece of flying advice is to stay away from trees and other shrubbery...
Congratulations on your first drone. I'm not familiar with that model, but I'm sure there are plenty of YT videos about it. If I can offer one suggestion, stay far away from trees and other shrubs. Oh, and don't forget to have fun...