Hello there my name is jacob I will be assisting you with This following issue please note if this dose not work please don’t hesitate to contact apple directly for more detailed support on this following issue you are having
So first things first you will need to understand the issue you are having with your phone what do I mean by this I mean if your phone is having a issue that is draining it’s battery you would want to check the following.
fiest go to battery Health settings and check your peak % if that is below 88% to around 50% you may want to consider reaching apple
now because this phone also happens to be older as in the 2015 model you might want to also consider the fact of it being old age maybe a factor as the new phones that have come out in 2018 to 2020 have better battery’s and a upgrade list of optimization so you can of course get more out of your phone
also another thing is understanding what your doing on your phone as it could also become a case of this issue
what do I mean by this I’m talking about your usage on your phone as in apps you could be running that could take a maximum amount of power in order to run at a higher level
or a lot of pop ups thoughout your web browsers that can become the creation of less battery life
if I were you sir I would of course look at everything you can as they are all factors that add there way into this
and maybe since this is a 2015 model you should also consider the thought of maybe a upgrade to another SE if that’s the type you like going for as we do have a iPhone 2020 se model that is of. Course way better running and offers a wide range of tools and a great camera
however it would of course be up to you I advise you to look over everything I hope this helped
