Indicator misleading battery for Chromebook C720-2848

I write this, the battery life on the left indicates, at 91% left, I have 10 hours and 10 minutes.  Other times I would have, say, 46% with 3 hours and 30 minutes. In fact, the indicator is in all directions with incredulous results that have no mathematical sense.  I just got the Chromebook. And any suggestions as to why this happens?

The battery life indicator is to help evaluate how much you have left life battery and an estimate and not an exact figure. The percentage may vary according to what you do on the computer. If you watch the video and the use of wifi, your battery will drain faster than if you type just a Word document while not in line and streaming video. If you get more than 3 hours out of your battery, it probably isn't a problem with your computer.

Tags: Acer

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