FriedChicken_II
Second Officer
Flight distance : 721555 ft
Hong Kong
Offline
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virtual Posted at 7-30 12:59
But there are wrong information. Depleted battery (at 10%) will never be dislpayed as 40% the next day. My MA2 with latest fw. performs forced landing at 10% of charge and refuses to take off. Only irresponsible operator would have tried to use this battery again and very likely it wouln't be possible to take off again.
Of course it is good practice to charge battery fresh for every flight to have usual flight time. But if You are aware of limitations of performance, You can fly with partially charged battery. Better value to watch is flight time. I have 27 minutes on fresh full battery, so I can make one 12 minutes flight on one place and another 12 minutes of flying on a different spot to play it safe, if the conditions (wind ect.) are about the same. If the battery wasn't recharged that day, flight time can be reduced significantly, so it is better to discharge the battery to at least 30% and recharge for flying next day.
It's just an example. What I really meant is that your battery loses accurate count of remaining capacity after being stored for some time after last use. With polarization effect this can only get worse.
LiPo batteries has a steep voltage drop after the platform voltage. Check this graph:
At 32min 35s, the battery had 3.6 volts.
After that, it drops extremely hard and fast and went down to 2.8 Volts only 3 minutes later.
What I did was just hovering the drone a feet above the ground to record this graph. No sudden moves.
With polarization your drone can magically get 0.1 volt or even higher after being stored for a day. However this voltage drops very quickly after being used again.
When you were having 3.6 volts and you stored your battery, next day you might see it starting at 3.7 volts.
And 3.7 volts means about 40% of battery left. 3.6 volts means about 10-14% battery left.
When you're going into sport mode, the drone consumes a very large current which can lead the voltage to jump even deeper.
It' s very common to store at 15% left, restart at 40% on screen, and then crash due to large amount of current causing extreme voltage drops.
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