What means Battery health Maximum Capacity 93% or any percentage on iPhone?

What means Battery health Maximum Capacity 93% or any percentage on the iPhone?

A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions.

To access the battery on Apple For iPhone 6 and newer, iOS 11.3, click on Setting, Battery, Battery Health:
Step 1 Setting ->Battery,

Step 2 Battery Health

The maximum capacity measures the device battery capacity relative to when it was new. A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions.

Not recommended:
Battery health unknown
If iOS is unable to determine the device battery health or the battery is health is less than 50% is recommended to change the battery.