The battery on my tablet device is a bit weird

The battery of the tablet device is a little strange.

I checked that the battery is over 90%, but after 1 to 2 minutes of the video, it drops to 1% and an alarm pops up saying that the battery is low.

Then it ends. Why is that?

Another strange thing is that the battery fills up quickly when you plug in the charger.

Is the tablet broken?

411 2017-04-08 Gentleman

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