@jibrilmoha55722 could be a bad battery. Remember it is the battery that reports the state of charge to the computer. Replacing it should resolve this, but at 79% I'd still keep using it.
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Download the service manual [https://www.ifixit.com/Device/HP_EliteBook_720_Series |from here] to work on your laptop.
@jibrilmoha55722 could be a bad battery. Remember it is the battery that reports the state of charge to the computer. Replacing it should resolve this, but at 79% I'd still keep using it.