12-06-2011, 09:12 PM
I mostly err on the conservative side. I do a rough calculation based on a throttle percentage like Drew suggested then, I set my timer for about 4 or 5 mins for the first two flights then see how the battery's cell voltage is when I charge them both back up. If it's over 3.8 V per cell then I add another minuet at a time until I get 3.7 to 3.8 V per cell after a flight. You will also get different flight times depending on how you use the throttle. You should have a feel if you've given it more or less curry in a particular flight and you should see this in the cell voltage as well when you charge them.
“The knack of flying is learning how to throw your machine at the ground and miss.”
"When once you have tasted flight, you will forever walk the earth with your thoughts turned skyward, for there you have been, and there you will always long to return." ~Leonardo Da Vinci