Gordon's Samsung Galaxy S5 is about 1 1/2 years old. The battery life is terrible now, and it's really sluggish. Leo says that at this point, a factory reset is the best bet in getting the phone back to its original configuration. Think of it as a spring cleaning.
As for battery life, a lithium ion battery only has about 500 charge cycles before it dies, so it may be getting close to the end of it's useful life. Time to get a new phone. Leo suggests the LG G5 because he can get a removable battery and expandable storage. But if he wants to get a Galaxy S7, the battery is really good. It's definitely better than the S5, which Leo said was a failure of a phone.