bjr981s
Captain
Flight distance : 139698 ft
Australia
Offline
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nullx8 Posted at 2-21 08:01
very insightful your post,
quick thing: is it better to "always" charge the batteries generally (using the DJI chargepad ?
The reason that the battery "swells" is because there has been a chemical breakdown in the cells and it has given off a gas. The gas is highly flammable. So there is a danger.
That also means that the cell is not 100%. Now the DJI sensor system in the battery that provides the battery cell voltage will warn you if one of the cells is damaged enough that it can't balance the cells.
So if you don't get a battery damaged warning it will still work OK.
Just be warned that it will continue to deteriorate and swell further.
There is a risk that the damaged cell may just give way in flight but its pretty small given the low C rating these batteries have and the small current draw.
Swelling batteries is a problem we face continually in flying Ducted Fan jets, as the current draw is so high
If you remember the C rating factor being A = CxAH so a 50 C 1,000mah battery will max out at 50Amps max draw.
But if its only half charged thats 25A etc. You can get into the voltage brownout situation if you put a call on the battery for a high current draw when the battry is low on charge. This results in a brownout that can effect the flight controller.
The best bet is to cycle the batteries as per the DJI instructions to calibrate the meter. And keep plenty of reserve battery at hand.
Flying Helis and Ducted fan or prop fixed wing we normally use a seperate battery for the receiver and Flight controller if fitted. If the main battery dies we can glide or autorotate to a soft landing. A Drone glides like a brick. So good battery management procedure is a must. |
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