Back in the good old days of flip phones, we had week long battery life. There was nothing to really drain the battery, since all you could do was make voice calls. Eventually texting came around, but it was several years before "smart" phones released. The galaxy s4 was my favorite phone ever, but the battery life was laughable, and it got HOT with continuous use. I learned that when a battery heats up, it loses capacity. From then on, I was a battery life freak. I still enjoyed my phones, but I learned about the 40-80% guideline and all the other tricks. I would always buy 2-3 battery apps. The one I liked best on Android is called accubattery. It has built in alarms and takes a lot of data. Most important to me is it would alert you at any set charge % with an audible sound. I put it at 80%. My wife would laugh her ass off at me when I would get up off the couch because my phone was 80%. She charges hers whenever she wants, and always 100% while she sleeps. It's been years since I routinely charged overnight. I'd even buy battery cases in order to make sure I could keep my phone at a reasonable charge %. The funny thing is I NEVER keep a phone past a year, so all I am doing is keeping the phone new for the next owner. I know many people on here are battery OCD like me, but my days of that are now over. I know all the "rules", but I'm done caring. I charged my phone to 100% last night (lol) and sold my battery case to an actual power user at work who needed it to get thru his day. Thanks to Newton's apple for helping me see the light lol. --- Post Merged, Dec 28, 2017 --- I still will not fast charge, wirelessly charge or use my phone while it charges. But charging overnight is too convenient to resist anymore. I'll give apple their $80 when it comes time.