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. Micro MinimOSD (detect voltage via VBAT pin)Ī current sensor allows you to see how much current is being drawn in real-time, and your flight controller can gather this data and give you an estimate on how much battery capacity has been consumed.Runcam Eagle 2 (detect voltage via VBAT pin).Matek F405 AIO FC (detect voltage via power input).Poor quality LiPo batteries tend to have worse voltage sag under heavy load, which leads to your low voltage alarms being triggered in error, before your pack is actually sufficiently discharged for landing.Įxample of FC, FPV Camera and OSD modules that have voltage sensing capability: For example when you do a punch out, the motors draw a lot of amps, and the voltage drops off much faster than under normal load, but when you lower your throttle the voltage will quickly recover again, this is called voltage “sag”. The biggest problem with monitoring voltage is that it decreases with fluctuations.
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Voltage sensor in MinimOSD – How to connect There are many ways of measuring battery voltage in a quadcopter. So it’s normal to land at 3.2V or even 3.1V per cell, and after some 10/15 minutes of resting it will come back to around 3.5V. However, for tiny whoops, because they use little 1S batteries, the voltage will sag more than bigger batteries. When you land, the voltage will come back up a little. Note that when you are flying, the battery is under load, and so the voltage will sag. Your LiPo battery is made up of cells, each ranging in voltage from 3.3V (absolute lowest voltage that should never be exceeded with risk of damaging the cells) to 4.2V (Maximum rated voltage, above which they may spontaneously catch fire), with the storage charge being 3.80V to 3.85V.Īs 3.3V per cell is the lowest voltage, it’s good practice to stop discharging your LiPo further when it reaches 3.5V just to be safe. The most common way of determining when to land is by checking battery voltage on the fly. Make sure to check out this article to find out more about how to look after your LiPo batteries. Please read our Affiliate Link Policy for more information.
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