There are two power saver modes in the Note 4 for those whose devices are running on low battery, and they wanted to keep the phone running with some compromises to the performance. (phoneradar.com)
Above all, you can also charge other phones using the phone and the one - key power saver, which puts the phone in ultimate power saver mode. (gadgetguide4u.com)
With an expanded power saver mode option it takes a four - strand approach to saving battery. (pocket-lint.com)