Galaxy S9+ battery died, turned back on with 35%?

Anyone else experience this? My phone reached 0% life and turned off, but when I plugged it into my charger, it came up with 35% battery life. I turned the phone back on while on the charger and the 35% was still there? I unplugged my phone and nothing happened. Still at 35%. I'm letting it charge still, though.

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