ios 11.3 officially

Why iOS 11.3 reports battery status 'Maintenance'?
after upgrading to ios 11.3, many of you wonder about the performance reduction feature when the battery is in maintenance status. so why is this message and what does it mean?
What do you need to prepare for iPhone while waiting for iOS 11.3?
the official ios 11.3 update may be released by apple in the coming weeks, from then on there are quite a few things you need to prepare for your iphone and ipad.