Why never used iPad has 85% battery life left?

Hello everyone,
I've turned on my new iPad for the first time, just after taking it out of the new sealed box. And the first thing that took my attention was that the battery life was 85% left (a little "thing" in the top right corner).
(Prior to that, as the new device, I thought I would need to charge it before I even use it, but I learnt from user guide that I don' t need to do that.)
Anyway, so my worry is- why was there not a 100% battery life left on the never used iPad?
Thank you!

About Batteries in Modern Apple Devices
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
Determining Battery Cycle Count
Calibrating your computer's battery for best performance
MacBook and MacBook Pro- Mac reduces processor speed when battery is removed while operating from an A-C adaptor
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Why never used iPad has 85% battery life left?

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