I have a question about charging my iPhone 6S, in which I just got a new battery and I'd like to see how long I can use this phone for. I find myself at my desk for an hour or so at a time, and often my phone will have 30-40% charge. I know that I won't be at my desk long enough to fully charge the phone, so I don't plug it in. The same for trips in the car. I was under the impression that when charging a phone it was best to fully charge it... that charging it only to 80% or so isn't good for the battery. Is that true?