Infrequent battery drain spikes

I have a Samsung a20, about 18 months old, which works nominally 90% of the time; however, about once every other week when it gets to low battery (~30%) it will begin to discharge at a high rate, dropping to low or zero percent in about 15 minutes. This usually happens when I’m using a more battery intensive app, specifically pokemon go. I have screenshots of the battery drain but i cant seem to paste them into here, they look like normal battery drain until a sharp drop. Also i should mention ive heard this could be a sign of a failing battery, but since its a relatively new phone and it only happens infrequently i want to check its not something im doing. I have the phone in battery saver, and device care says theres nothing wrong. Thanks for your help.

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