Dan B-P4
Second Officer
Flight distance : 1247913 ft
United States
Offline
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Ok to vague but wanted the log to speak for itself to start out. I'd add the narrative once you've everyone that wanted to had time to look it over.
What happen,
I bought a P4 from a authorized dealer, it included two batteries. One in the box with the drone sealed from the factory the other following in a separate shipment.
When I didn't get the second battery I questioned the dealer, my suspicions where raised based on comments they made about the origin of said second battery. So I asked a question also I stated that the listing stated that it included 2 DJi intelligent flight batteries and nothing about any "third" party battery as part of the deal. I was assured it was going to be a DJi battery and when they get more they'll send it right out. (got it right away not the issue here)
The battery shows up and sure enough its a Powerextra battery not a Dji battery like in the box. The original sealed in the box being dead sent back for a new one. In the end I sent it back they refunded me for it, I bought a new one local here, a Dji 5870mAH battery.
The PE battery while seamed to work just fine a couple of times I got a "battery error" but nothing under "warnings" in Dji go to describe the problem beyond that , just said "battery error".
So I called and asked if I should send it to them or Dji, they stated either one if I choose to do that but didn't sound necessary as voltages where near perfect. (I had to return a second Dji 5870mAH as it suffered what would be considered major cell deviations.
I thought perhaps the battery lost connection momentarily but not effecting flight, I powered it up releasing the battery latches here on the table in attempt to cause same. I could move the battery all around as much as it could move and no error. With latches released I could pull the battery out very near the limit of its contacts and no error. Strongly suggesting to me that at no time does that battery loose contact with the drone.
I asked the dealer a direct question "has Dji blocked any such info from Powerextra batteries in the firmware to stop or an attempt to prevent use?" No was the response but offered no reason it didn't offer more other than "battery error" no other info with it.
So the above flight was a test of that battery to determine if that battery needed to go back or not. Keeping in mind now that I make sure all battery's are firmly pushed in place and locked there. The previous battery errors mostly tend to happen during landing just as drone touched the ground, I believe three total one of those being during mid flight. Of probably four to five total flights with that battery to start with.
So I fly around and low to the ground just to error on the safe side to see if I get another error with it, I fly and nothing not a hickup other than it reporting incorrect distance from the ground. Sunny day but the sun had dropped below the tree top level so was heavy shade. I noticed fly over the grass it was off by more than flight over the asphalt. I compare reading on screen to how tall I am, 6'2" it reporting 7 or 8 feet depending on how long I gave it to recalculate.
So I decide to bring it in swap out the battery for another one and see if the same happens, as I think about it at the time it seemed as every time I used that battery it suffer the same.
No problems in flight other than that to that point, and no big deal even understandable perhaps given conditions. Keep in mind its shady but in no way "dark".
I fly down the parking lot let off forward pitch to change to sport mode lean back into forward in attempt to arch it around to bring it back to me, all a sudden and while in plain view of my wife and I it goes dead silent. The hum of its blades gone as we watch it pitch forward no power full forward roll landing on its four propellers. The battery was in it until it hit the ground, the battery is fine.. the P4? well not so much.
Now at the end of the flight log it lists its height at 77 feet, it was about 25 maybe 30 feet off the ground when it went dead silent. Needless to say it didn't work anymore after hitting the ground but had it been 77 feet it would have been much worse.
One motor wouldn't "spin" like the others, while you could turn it it wasn't normal. I do not know it that happen in flight or damage suffered hitting the ground. It literally made a forward roll 4 point landing on its propellers/motors.
Myself reading the log I do not see what brought it down.
Any questions please ask. |
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