Is “re calibrating” the battery really necessary?
So I got a new battery installed by apple in my iPhone 7 last week, and it’s kinda driving me crazy. It’ll go from 100% to 85% in the first few minutes of use each morning. It drains in half the time as the old one, then will jump to 70-80% in the first few minutes of being plugged in.
According to the iFixit website, this is normal for all new batteries until they are “re calibrated”, by draining the battery until phone turns off, then charging it to 100%. In fact, the article says, you should do this once a month to keep your battery always perfectly calibrated.
Yet I have read here, and elsewhere, that draining your battery all the way is a death sentence for lithium ion batteries. That we should try to avoid ever letting our batteries drain all the way, and even charging to 100% is bad. That these batteries should be kept between 30-80% for maximum battery life.
How can both be true? Am I really supposed to drain my battery when it’s new? Or do that every month?