Battery level drops on Kestrel

Battery level drops on Kestrel

The reason behind our battery life indicator dropping in cold, hot, or suddenly is because Lithium batteries don't lose their capacity in a linear fashion so it is difficult to precisely determine how much battery life is left based on the voltage of the battery. Essentially the battery keeps a very high voltage until the very end and then it drops off rapidly. If you take a look at this chart below, you can see that the line goes pretty much straight across until it drops suddenly. So the Kestrel may not show a drop in % until close to the end of the battery life. In the cold, the voltage will drop a little more so that is why you see a difference in that aspect.

 

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