There are many different forms of low voltage alarm you can have on your quadcopter. If you do a flight time test “at a hover”, then recharge the same pack and go and fly an aggressive acro or racing session, you will often find that the battery provides a flight time of less than half of what was achieved during the hover test.įor me, timing flights is a last resort when there really are no better options. The result is the same as with a car, the faster you drive the more fuel you use. Remember battery usage can vary greatly between flights depends on how you fly. Timer is an extremely primitive method for determining when you should land. If you don’t have a current sensor on your quadcopter, you can also set up a “virtual current sensor” as shown in this tutorial. ![]() Note: current sensor might be inaccurate upon first use, see this guide for information on calibrating current sensor. current sensor as well as voltage sensor. When using partially discharged batteries you won’t know the exact initial capacity, this is why we say it is best to have more than one solution in place, i.e. Therefore, this method only works with fully charged batteries. If your battery is disconnected during a flight and lost previous “mAh consumed” data, your won’t be able to determine the power left in the pack. The data from a current sensor resets to zero when the power is disconnected, or when the FC restarts. You should not however, rely solely on “mAh consumed”. The 90% rule… You should land when you have used 90% of your battery capacity! At this point the battery should theoretically be at around 3.5V – 3.6V. “mAh consumed” is a much more accurate indicator than voltage to decide when you should land, because it doesn’t fluctuate with throttle levels like voltage does. Since you know the capacity of the battery, you are able to work out exactly how much juice is left in the pack.
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