The ideal state is to keep the battery charge between 20% and 80%.
I have always been used to charging at any time. I have put more than one wireless charger in the living room, bedside, car, office and other places, so the power of the two mobile phones is basically kept between 40% and 90% every day.
It has been a whole year since I first bought mi 10u in August last year, and the current battery status is "excellent".
I bought the iPhone 12PM for the first time at the end of last year. It has been half a year, and the battery is healthy 100%.
Therefore, for mobile phone batteries, it is probably a better way to use them when they should be used, which can eliminate the anxiety of power consumption and help to prolong the service life of the battery.
As for whether the mobile phone will spontaneously ignite or explode, if the brand quality is good, the possibility is relatively small, because the current mobile phone has battery protection function, which can protect the battery from being overcharged and discharged, and minimize the risk of spontaneous combustion or explosion.