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.