FriedChicken_II
lvl.4
Flight distance : 721555 ft
Hong Kong
Offline
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From what I've learnt, after a certain time of not being used, the controller would measure an open circuit voltage as the initial sample for the calculation of remaining capacity.
However, this is highly inaccurate, especially when you've used the battery to somewhere like 60% or even lower in the previous flight. This is because that batteries have an effect called polarization.
Due to battery polarization, the voltage of your battery can be "recovered" after not being used a lot which can fool your battery controller.
Let's say that your initial battery voltage was 4.3V@100% and then you used it to 3.5V@10%.
After you pulled the battery out and stored it for a day, due to the polarization effect, the battery's open circuit voltage is now 3.6V. You see, the problem is, you didn't charge your battery, didn't feed it any energy, but due to the polarization effect, the battery magically gained 0.1 Volt.
Now the controller has lost its previous actual power usage calculation based on V/A meters, so now it can only rely on the open circuit voltage of your battery to calculate the remaining battery life.
So the controller reads a 3.6V, seems like 40% of remaining battery, then it reported this to the drone.
However, polarization is not free energy. The polarized voltage would drop immediately once the current returns. With a large amp, it would only get worse.
That's why never fly a battery lower than 80% after discharge and storage. Never. Always recharge your discharged and stored battery!
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