Are those intelligent batteries stupid?

Joined
Aug 7, 2016
Messages
1,195
Reaction score
709
Or should I say that the programmed algorythm is stupid.
This was discussed several times that if the voltage of bat.cells drop under the defined level the batt will shut off. The explanation is that in this way the batt is protected from damage.
But who should do such wise action if the drone is in flight. Is the battery which is protected or should be the drone? If the drone is crashed to pieces, a protected batt is of no use anyway.
Much better solution would be if the motors gradually loose the power so it will land when this happened.
 
  • Like
Reactions: MTO and ianzone

ianzone

**P4**
Joined
May 22, 2016
Messages
6,969
Reaction score
4,730
Age
51
Location
NZ
Agree I lost a p4 due to battery shut down,,those batterys to clever for their own good,that's artificial intelligence for ya,the batterys dont need to be clever, they just need to charge and discharge when used like a normal batt,the drone should be in charge of what's going on,not the batt,,this has ripped my underwear for years,I still dont trust them
 
  • Like
Reactions: MTO
Joined
May 1, 2017
Messages
3,501
Reaction score
2,806
Age
67
Location
N.central wv. U.S.
People love to quote," knowledge is power " If you don't know how to use that power, you can blow yourself up. Lol. Intelligence does not denote
wisdom. I think that is the case here.
(Removed by moderator-Rule 13)
 
Last edited by a moderator:
  • Like
Reactions: MTO and SKY-SPY
Joined
Jun 30, 2016
Messages
1,380
Reaction score
590
Location
PL
I can't say I understand that fully, but it would seem that DJI really acknowledged that, and did some modifications to the battery in latest drones. Everything Mavic Air + has the mechanisms within the battery altered to what the manufacturer (Texas Instruments) normally provides.

I've seen speculations that some conditions on turning off power immediately are eliminated. It can still do so, ie. if the cells temperature is so high it's going to burst into flames any moment.

But I'm pretty sure if such situation happens, the battery won't turn on any more after you finish the flight.
 
  • Like
Reactions: MTO

DoomMeister

Moderator
Staff Member
Premium Pilot
Joined
Mar 5, 2019
Messages
179
Reaction score
212
Age
63
Location
Florida’s Friendliest Hometown
Gosh are you referring to batterys shutting off at 15% or jet engine fuel shut down,glad I dont go on those things lol,shouldn't the batterys aheed to dji batt low warning or critical setting before it auto land from low power ,my brain functions are asleep but trying to make sense of that,I guess all the smart settings must be off since they predict the flight ?
I think I confuse myself now ha
Just commenting that the battery should not be able to shutdown to save itself if the aircraft is airborne. The ability to do that would be akin to the fuel tanks on an airliner determining when to halt flow to the engines.
 
Joined
Aug 17, 2020
Messages
184
Reaction score
108
Age
36
Days ago my Phantom3S arrived from one of many previous fully autonomous 6-mile round-trip Litchi missions with a battery level inching below 20%. The instant I toggled the controller switch to invoke my usual textbook smooth glide-slide landing approach, the engines shut off, the lights died, and my diabolical nemesis, gravity, took ruthless control of the craft at 140 feet AGL.

Prior to stumbling on this discussion topic, it never occurred to me that a DJI flight battery could abruptly shut down in low charge conditions mid-flight by design. I was aware that the Phantom3S was programmed to go into a forced descent and autolanding whenever battery power dipped below 10%, but this is the first time I have heard of this "sudden battery death syndrome", which I now realize in retrospect may have been the cause of my late Phantom3S' terminal impact with concrete from 140 feet up in the air.
 
  • Like
Reactions: MTO

captainmilehigh

Premium Pilot
Joined
Apr 4, 2016
Messages
1,901
Reaction score
1,632
Location
Northeast Florida
That as a tongue-in-cheek statement in relation to a smart battery shutting off in flight to save itself and sacrificing the aircraft.

Oh yeah, I knew what you meant. No problem.

Just never have heard of a smart battery shutting off by itself, to 'save' itself. Mine have always performed as programmed in 'settings'.

Granted some of my batteries are a bit older and drain faster than the newer batteries, but that's to be expected.
 
  • Like
Reactions: ianzone
Joined
Aug 7, 2016
Messages
1,195
Reaction score
709
Let me clear something up. Of course there are many warnings (acoustic and visual) which informs you that the batteries are going low and then at last the drone go to autoland mode. That's OK.
But I was talking about the voltage of cells. This is not absolutelly comparable to the percentage of remaining batt.
If you have one cell in your batt. that is not so good as others then if the voltage of this cell falls under I think 3 V or something like that, this would be the shutoff point even if your batt. shows more than 25% of remaining power. That's the problem. And this is why it is so important to start the flight with fully charged batt.
 
Joined
Oct 29, 2018
Messages
806
Reaction score
639
Location
Miami-Dade
I have my C2 button toggled to my battery view and I check it intermittently while flying. I check voltage per cell and battery temperature as it does get hot down here. It’s a habit like checking your car gauges when you drive.
 
Joined
Aug 7, 2016
Messages
1,195
Reaction score
709
Yes, t is always useful to check the batteries during the flight. Especially check if any cell behaves abnormal.
 
  • Like
Reactions: ianzone

ianzone

**P4**
Joined
May 22, 2016
Messages
6,969
Reaction score
4,730
Age
51
Location
NZ
Yeh simple to set up to,I never thought of this
If my drone dont sell I be doin this
Great idea,,I relied on litch lady feedback
 
Last edited:
Joined
Aug 17, 2020
Messages
184
Reaction score
108
Age
36
The mystery deepens. Here is my shortlist of possible reasons that Phantom drones drop like rocks.

1. Sub-standard non-OEM batteries that shut off abruptly under circumstances not as yet fully understood.

2. Batteries made by DJI and other after-market vendors, that shut down if one of the cells malfunctions.

3. Failure to clean the battery terminals of the drones, per the recommended service intervals in AirDataUAV.

4. An improper entry made in the DJI Go app, regarding the percentage of charge at which a battery should shut down.

With my replacement Phantom3S inbound and due for delivery today or Monday, I sure hope I can learn more about this sudden battery death syndrome, to stop it from happening again.
 
Last edited:
  • Like
Reactions: ianzone
Joined
Oct 31, 2019
Messages
2
Reaction score
2
On a similar note I once saw a $500,000 turbine helicopter drone fly. During one test at around 100ft up the load became too much and the turbine shut itself down due to an over temperature condition, in order to protect itself. They helicopter then crash landed and I am sure the shock load to the turbine would have done substantial damage at best, and destroyed it at worst. I am all for giving the pilot big red warnings, alarm bells etc in such a situation, but let the pilot choose to destroy the engine whilst landing the aircraft successfully if they choose. My 2 cents worth.
 
  • Like
Reactions: Billie Nelson
Joined
Mar 5, 2017
Messages
30
Reaction score
11
Age
116
Yes, t is always useful to check the batteries during the flight. Especially check if any cell behaves abnormal.
I wish this thread had been a week earlier!! :(( After watching my ac fall out of the sky during it's own induced RTH, the second pic shows a bad cell - could this have been the cause? are these Batteries now repairable or disposable? ie should I send it along with the ac to the repair centre, please?
 

Attachments

  • Crash2021-04.JPG
    Crash2021-04.JPG
    4.6 MB · Views: 11
  • BatteryCellX.PNG
    BatteryCellX.PNG
    333.7 KB · Views: 11
  • Sad
Reactions: ianzone

ianzone

**P4**
Joined
May 22, 2016
Messages
6,969
Reaction score
4,730
Age
51
Location
NZ
I wish this thread had been a week earlier!! :(( After watching my ac fall out of the sky during it's own induced RTH, the second pic shows a bad cell - could this have been the cause? are these Batteries now repairable or disposable? ie should I send it along with the ac to the repair centre, please?
Oh man feel your pain there,,still under warranty, battery or amount of charges probably expire before the year is up but certainly shows that cell went bad,,,mine were good but had same outcome,,I still have the culprit batt and it still good but wont use it,,ugly outcome,I unsure what say but you be in for new battery if a repair shop does it but dji might cover if drone within that 1 year warranty...mayby it sensed the loss of volt in that cell since it yellow
 
  • Like
Reactions: Twilightdrone
Joined
Mar 5, 2017
Messages
30
Reaction score
11
Age
116
Oh man feel your pain there,,still under warranty, battery or amount of charges probably expire before the year is up but certainly shows that cell went bad,,,mine were good but had same outcome,,I still have the culprit batt and it still good but wont use it,,ugly outcome,I unsure what say but you be in for new battery if a repair shop does it but dji might cover if drone within that 1 year warranty...mayby it sensed the loss of volt in that cell since it yellow
(you're up early! Must be the new 'travel bubble'!! ;) I'm in WA)
Nah - batteries are 4 years old and that dud was operating perfectly that flight until it got down to a certain level and instead of landing automatically, it shut down the motors at height.
If it's better to replace the batteries then maybe I should send the remote as well, as it is only charging to 75% ? Or are they a DIY job?
 
  • Like
Reactions: ianzone

New Threads

Members online

Forum statistics

Threads
140,614
Messages
1,449,376
Members
102,416
Latest member
K.J.