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Battery warning
312 8 2018-8-13
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fansd6a7f95d
lvl.3
Flight distance : 240974 ft
United Kingdom
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I keep getting a warning to return home and discharge my battery to less than 5% . I have done this but the warning keeps coming back is the drone safe to fly and is there anyway I can remove the warning..?
2018-8-13
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Peterx
Captain
Flight distance : 1479547 ft
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Do you have a screenshot of the message? After discharging the battery did you charge the battery fully again? How is the cell devastion?
2018-8-13
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Mark The Droner
Captain
Flight distance : 2917 ft
United States
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I would look closely at the cell balance.

Good luck
2018-8-13
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fansd6a7f95d
lvl.3
Flight distance : 240974 ft
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Thank you I have checked the battery levels and they were 4.25 3.9 4.56 4.28 and when I was checking them the one at 3.9 went to red ana returned to 4.27 and now seems to be stable with all cells the same any advice
2018-8-13
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solentlife
Captain
Flight distance : 1087530 ft
Iran
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"Thank you I have checked the battery levels and they were 4.25 3.9 4.56 4.28 and when I was checking them the one at 3.9 went to red ana returned to 4.27 and now seems to be stable with all cells the same any advice"

Not good at all .... you have TWO bad points there ... BUT ... with that cell jumping back to others level .. I would suggest cleaning all contacts - see if that helps ...

If that does not cure it then :
3.9V is definitely out of step with other cells. This shows a bad cell.

4.56V is now a damaged cell IF THAT FIGURE IS CORRECT and not a typo ? as it has gone over the 4.35V max. LiPo cells of normal issue are 4.20V max with a tolerance to survive a little over - but the DJI cells are Lithium High Voltage of maximum 4.35V. This comes at a price ... it has NO TOLERANCE to be charged greater than that 4.35V.

I would suggest carefully checking that battery when charging and in GO to see what is happening ... I would not be comfortable with that pack anymore for flights ... but OK for bench testing / updates etc.

Nigel
2018-8-13
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Mark The Droner
Captain
Flight distance : 2917 ft
United States
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Be advised:  The distance guys are now learning how to max out the stock battery cells to use with the two after-market externals hanging on the side to provide ultra-long P3 & P4 flights of an hour or more





2018-8-13
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solentlife
Captain
Flight distance : 1087530 ft
Iran
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Hi Mark ... that is crazy .....

I used to max out 4.2 cells to 4.35 HV state ... but they did not last long. A 4.2V cell has a threshold tolerance to 4.35V as I was told by a Mallory Tech.

I was told that 4.35V cells do not have that tolerance ... so I would not do as those guys personally ...

Interesting ..... as they say - takes all sorts !!

Nigel
2018-8-13
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Mark The Droner
Captain
Flight distance : 2917 ft
United States
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solentlife Posted at 2018-8-13 05:15
Hi Mark ... that is crazy .....

I used to max out 4.2 cells to 4.35 HV state ... but they did not last long. A 4.2V cell has a threshold tolerance to 4.35V as I was told by a Mallory Tech.

Yes.  But it's only crazy if you're sane.  See the P3 long distance thread in the other forum.  There is whacky outside of the box stuff going on over there
2018-8-13
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solentlife
Captain
Flight distance : 1087530 ft
Hong Kong
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In all the years of RC ... to be honest its hard to surprise anymore...

I was running a small Parkjet designed for a 100W motor on a 450 Heli 5000kv motor, 4S lipo, 5x5 prop developing over 700W and wiping out motors every couple of flights to get speed records. Finally to get the run time and the 222kph - I had to go back to 3S and 4.5x4.5 prop ....
The next attempt with another Parkjet was TWIN 250 3200 Heli motors ..... 300kph ....

Since then and pushing EDF's to limits - I've decided to take it a bit easy !

Cheers
Nigel
2018-8-13
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