PeteGould
Second Officer
United States
Offline
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w1der Posted at 2015-4-30 01:06
It might be like this ... if you keep flying down to 20% and rechearge from that level ... Soon enough the "logic" within the battery will "think" that 20% is 0% ...
I agree with your theory. Specifically: (a) I agree there is no memory effect with lipo batteries, and (b) I agree that the issue has to do with how the software interprets battery levels, possibly adapting (wrongly) to batteries that are never deep-discharged.
My CONCERN, and I don't know whether it's valid without someone from DJI commenting, is that we have no idea what software algorithm is used to count down those percentages on the remaining charge. We DO know that when it decides the battery has discharged to the minimum safe level, it will absolutely turn the sucker off, even if that means dropping the Inspire from 100' onto concrete or into a quick-flowing opaque brown river. I've now heard several instances - we all have - of batteries with seemingly normal amounts of charge (40%+, 70%+) going from that amount to ridiculously low (8%) in a matter of a very few seconds. We've also had some Inspires shut off, reportedly without warning, and drop. The unanswerable (to us) question is: is this a physical fault of the Inspire, or of the battery itself, or could it be the result of the "Intelligent" component of the battery system going haywire because it lost track of a reference that is maintained by deep-discharging? I have not a clue because I don't know if they made any part of the battery software algorithm adaptive or if it just uses a preprogrammed hard reference as its benchmark (in which case the software doesn't give a rip about deep discharging). An adaptive component would make some sense because it would deal with alterations in battery behavior as it ages.
What I DO know is that as long as these things are happening and DJI appears to be stepping forward from time to time and covering these disasters, I want to do (and encourage others to do) EXACTLY what DJI says to do in maintaining these things. The very last thing I would want to see happen to ANYONE is that they follow user advice in this forum that does not square with DJI's recommended practices, and find that it cost someone a warranty replacement of a destroyed aircraft. |
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