"They're also charged to full capacity or depleted to empty a lot of the time."
Does it affect battery life if I keep my phone charged even if it's at 100% ? (My phone is charging during the night, so it will be at 100% for a long time and keep charging).
If it reaches 0%, how does that impact battery life compared to reaching 20% and charging up ?
I never looked up these things but it might influence how I charge all my devices.
Modern batteries deteriorate from heat and from the time they spend at the extremes of their charge cycle. As a general rule of thumb, you would get the lowest amount of wear by keeping the battery as close to 50% as possible all the time, only charging higher than that right before use and just enough to make it comfortably to the next charging opportunity. One of the worst things to do to a battery (not as bad as a deep discharge) is keeping it on full charge standby all the time. Think desktop replacement laptops.
For a while I only charged my phone in the morning when it was still at >50% in the evening, e.g. a 40%-70% charge. In the end, convenience prevailed.
Sounds like an opportunity to have scheduled charging. I'd like to plug my phone in at night and have the phone keep itself at some minimum until an hour before my morning alarm. Then start charging so it reaches 100% just about the time I wake up and unplug. Maximizing battery life might conflict with phone manufacturer's goal of getting you to buy a new phone every few years.
