SM-T285 Battery problem? - Samsung Galaxy Tab A series Questions & Answers

I have this Samsung Galaxy A 7" 2016 SM-T285 for about 3 years now but suddenly the battery charges slowly and now, the battery percentage was 57% but when I plugged it in to the official charger it went to 99% in less than a minute. Could this be a battery problem? or a sensor of the battery problem? I don't game on this thing, I used it lightly. Does anyone have any experience on their tab or just other samsung phones about their batteries?

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