This is something I’ve noticed with /e/OS that it does not show a low battery notification (when it reaches 5%) like stock Android. Many times, I just don’t pay attention to the battery percentage and the phone just ends up shutting down, which is so annoying.
I am surprised a bit, where did you get the idea of 5% warning? I had stock android phone before and it used to give 20% and 10% warnings, my Murena e/OS does exactly the same! 20% and 10% warnings work perfectly fine offering to switch battery saver on…
I don’t think there is any problem to resolve really