Samsung's official kit for the Note 4 gives you a spare battery, protective case and external charger
All told, the Samsung Galaxy Note 4 has pretty good battery life. In our review we found that Samsung's latest could get us through into the night on all but the busiest of days. However, having a removable battery gives Note 4 owners the option to swap in a second cell in busier times.
That's just what the official extra battery kit from Samsung allows you to do, while also giving you a convenient way to charge a battery outside of your device. Effectively, you've got a relatively easy way to double your useful battery life when travelling, and a handy alternative to keeping your phone tethered to a wall when it comes time to charge.