Labroides Posted at 2017-8-26 19:50
Geebax gave you the answer back in his first post.
You may have flown with a partially discharged battery and got away with it in the past but it's asking for fall-from-the-sky trouble.
I'd have a lot more in my spare battery account if I had $1 for every case I've seen just like yours. Labroides I've read about this issue before, or something similar, that said, I have a few questions about this and what you wrote, if you would not mind. 1) How can you tell you have a bad battery? Are there any indicators or warnings to look for that will tell you something is wrong and going bad, before an event like this?
2) Why is this system designed in a manner that if you use a partially discharged battery you can’t get accurate indications of its charge state? Conversely, why does a fully charged battery provide more accurate information (I’ve read that even that is not necessarily so either)? Why is there a difference between partially charged and full?
3) 3.3V appears to be a magic number, what is that based on? Could there have been a problem with the drain rate, due to being in Sport mode, which caused the system to not keep up with the battery level/state?
4) It’s my understanding, based on the manual, that when the battery reaches the Critical Low state it will initiate an RTH and/or land immediately. Can you explain why that did not happen here?
Thanks, I’m sure your answers will be beneficial and help immensely, and possibly aid others in preventing them from getting in to similar situations.
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