Depending on the battery and device, 0% may not actually be 0%, likewise 100% may not be 100%. Many modern devices with lithium batteries have protection logic that keeps the battery in the 10-90% charge range during normal use and just lies to the OS or user about how much charge there is.
Going outside of this range can permanently damage a lithium battery, so there’s a good reason for this deception.
A device left in storage for a long time can actually hit 0% through gradual internal drain and will often not function or charge properly afterwards.
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