Why did my battery drain so quickly? Like from 40 percent to 0 in a second literally?
Added (1). Like just now, my phone was like at 32% but suddenly turned 18%, and when I plugged my charger in, it automatically turned to 0% and turned off. This doesn't always happen, but I don't know the cause of it. Also, whenever it gets to 15%, the battery drops to 2% as soon as I charge it every single time. My phone's Samsung Galaxy Note 4 btw.
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Why did my battery drain so quickly? Like from 40 percent to 0 in a second literally?