I'm using TP 4s 3900 mah batteries in a 68 oz model and I'm trying out some props.
When I land, the Hyperion IOS Sentry shows that I have about 21% left in the battery.
However, when the battery cools down to room temperature it says I have 28% left.
Now I know it's not good to go below 20%, but is that measurement taken when the battery is warm straight after a flight or when the battery is cool?
Also, does the voltage variation from warm to cool mean that the batteries are getting tired?