@drahcirjam57159 discharges to fast to be strictly a settings or storage issue. teh very first thing you want o do is to change your battery. It may charge but obviously does not hold a charge. Since iFixit does not yet have a guide for this use something like [https://www.youtube.com/watch?v=RQBGZFy9SXA|this video] Replacement batteries are readily available at many online stores.
While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
Repair is War on Entropy!