Why does my phone shut down even when it has enough battery percentage?

The battery can be at any percent between 49 to 50. It often shuts down between 49 or 50 and once it shuts down it cannot be turned on. I have to charge it from zero percent again. I have changed batteries but it remains the same.
One more thing, the percentage won't decrease for a long time. It stays put on say 41, then after using for a bit it suddenly starts draining rapidly and shuts down before it hits zero percent.

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