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. 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.
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