iPhone X went from 20% to 1% In less than one minute

sudden difficulty charging my iPhone. Phone will not except charge with brand new cord and adapter. This just started this morning. I have put the phone on my disk charger. That seems to work as soon as I remove it from the charger it drops 20%. Yes the battery probably needs replacing but it charges beyond 76% which it indicates is its capacity.

In a nutshell something has happened in the 10 hours.

I have checked the battery and the apps that I have used it. Nothing seems to fix the charging situation.

Again information I’m at 16% right now as soon as I remove it from the discharger it will go down to one percent. Any suggestions any help? Very much appreciated thank you.