Probably a bad cell, but follow the link below and upload your flight data from your device to see for yourself. If you wish others to verify for you, place a link to the uploaded file back here. Instructions are on the link.
You needed to upload it to the link I provided. But here is the uploaded and converted file for you. Initial look says bad battery cell, but you can look as well.
Ok, I uploaded the file to generate what you provided. It looks like all of the cells were in red. So does this mean the (entire) battery failed; not just a single cell? And was there anything I could have done preflight to have avoided this crash? Thanks.
In this particular case most likely not. The first rule here is you should never takeoff on a partially charged battery. This is asking for trouble.
I normally launch with a fully charged battery; this was my first (and last) exception. I have known for sometime I was not keeping track of my battery use. So, I don't know how many times the battery was charged. I think there are other things that must be done to properly maintain batteries, but again I guess I failed to complete them. Now I'm trying to decide what to do with the damaged aircraft. Buy a used P3P body, parts it out, junk it, upgrade. But certainly I'm going to be more rigorous on battery maintainance and I'm sure there's a website for that! Thanks again. Very helpful.
With proper maintenance and absolutely ideal conditions if is possible to get 200 cycles. I would retire the battery before that however.
The battery reached the critically low level and the Phantom started to auto land at its current location (as designed). While it was auto landing, you flew it over top of a tree. It then finished descending and crashed into the tree.
The auto landing was initiated earlier than expected due to the low voltage level. If you're going to fly on an extremely low charged battery (like 53%), you need to go very easy on the sticks. Doing any kind of full stick (or near full stick) movements really puts a lot of stress on the battery. That stress makes the voltage temporarily dip down to lower levels.
Because the battery % indicator only gives an accurate reading when you start with a fully charged battery.
Are you sure about the 3.2V LVC? I’m almost certain that was revised to 3.0V in later DJI battery firmware. We had a lot of unscheduled landings with the 3.2V sag. Adding the propulsion output limitation algorithm has saved a lot of us also.
Not 100% certain, but this could be true in more recent firmware. I just recalled the 3.2 LVC. Either way it's still pushing the battery a bit.
Flydawg, can you elaborate on "maintaining properly," or point me to where I can learn more? I don't do anything, that I know of, other than try to run them down to about mid twenties, percent-wise, and store them that way between flights if I can help it.
