This is usually common with Samsung phones, The battery would all of a sudden begin to heat up and the battery level begins to drop. I have had cases where I put my phone in a cold or hot environment, and the battery begins to drain as it increases in temperature. I have used both iPhone and Samsung, and I can tell that this is very common with Samsung. In fact, my S20 does the same thing.
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Exactly, I guess Samsung phones had a lot of heavy components that drained the power faster.