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Tutorial: How to fix a Battery cell error on a DJI battery
6011 8 2018-9-18
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Ronny G
lvl.2
Flight distance : 1352877 ft
Sweden
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Hi
Had problems with one battery on my M600 But this would probably work on all DJI Lipos
Got red battery cell error and battery cell broken so i could not fly with this battery set... 20180916_121257.jpg 20180916_121312.jpg


When checking the cells on one of the batterys it was badly balanced >0,1V from the other cells
How to check single cells
1. Go to settings in the upper right corner and click on battery icon
2. Click on one battery

3. Check that the cells are within 0,1V
20180918_090126.jpg
This battery is ok but check all 6 batterys

Tried to leave the drone on until discharged and recharged the lipos but same fault.
No warranty left so I have to fix this instead of buying a new expensive battery

Solution
Balance the lipo with your normal lipo charger.
NOTE!
This is only for you that are familiar with Lipo charging, chrimping contacts and soldering DO THIS AT YOUR OWN RISK!!

1. Take away the plastic top of the battery with 6 pieces of plastic (cut out of some plastic lids for food storage)
20180917_111021.jpg
Insert plastic pieces on all 6 locking points

2. Carefully remove top part
20180917_111025.jpg

3. Unscrew 4 screws
20180917_111035.jpg

4. Remove the Molex Picoblade (think its called so..)
20180917_111810.jpg

5. Make an adapter cable JST XH 7 pin (robbed an old lipo balance plug) to a Molex picoblade 7 pin
NOTE cell one on dji lipo is the red side
20180918_085937.jpg

6. To bypass the DJI electronics to get live power on the battery charging contacts I just carefully put a crocodile clamp through the two solder points at the pic below
20180917_122344.jpg

7. Make a charging cable from an old deans male contact cut in half and a suitable XT60 or other that will fit your charger
20180918_094529.jpg

8. Connect to battery as in the picture
20180918_094605.jpg

10. Balance charge and make a few cycles until lipo is ok
20180917_125430.jpg

Hope this helps somebody

Best regards
Ronny Grimm
GrimmDrone AB
SWEDEN



20180918_090126.jpg
20180917_111854.jpg
2018-9-18
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DJI Tony
Super Moderator

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Hi, Thanks for sharing this tips, however, this should be done by professional due to may lead to battery combustion. Please be careful on this scenario. Thank you for the support.
2018-9-19
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Ronny G
lvl.2
Flight distance : 1352877 ft
Sweden
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DJI Tony Posted at 2018-9-19 10:29
Hi, Thanks for sharing this tips, however, this should be done by professional due to may lead to battery combustion. Please be careful on this scenario. Thank you for the support.

Hi
Agree! Thats what I tried to say in this phrase in my topic above.

"NOTE!
This is only for you that are familiar with Lipo charging, chrimping contacts and soldering DO THIS AT YOUR OWN RISK!!"
2018-9-20
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DJI Tony
Super Moderator

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Ronny G Posted at 2018-9-20 06:10
Hi
Agree! Thats what I tried to say in this phrase in my topic above.

Thank you for the support and putting an important notice on this case. Please don't hesitate to reach us if you need our help. Cheers!
2018-9-23
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AQUIF
lvl.4
India
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hey Ronny ...

good info there...!!!...

can you tell us how many batteries were mis balanced & how many  balance charge cycles were needed to revive the battery?
1-25 12:44
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Ronny G
lvl.2
Flight distance : 1352877 ft
Sweden
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AQUIF Posted at 1-25 12:44
hey Ronny ...

good info there...!!!...

Hi!
Only had one battery that was misbalanced.
Made two cycles and then it worked ok. Maybe one cycle would have been enough?
//Ronny
1-28 02:58
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youyoung21147
lvl.1

France
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Thanks Ronny !

So there is no self-destruction feature on the battery PCB, that would tell the drone that the battery was disassembled and is no longer able to be used ? That's good news ! Because some batteries have a software fuse that prevent the battery from being used if the cells are disconnected from the PCB.

Also, do you think that would be feasible to replace those cells with a different, higher capacity model ? (thinking 21700 for example)
8-30 14:14
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patiam
First Officer
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United States
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This is the kind of stuff that makes this forum worthwhile. Thank you Ronny!
8-30 15:38
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scorpiopaulius
lvl.2

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I started to have similar problem. but my misbalance started at 117cycle... and my misbalance is very big :/ like - cell 1 - 3.7, cell 2- 3.2, cell3- 4.1, cell4-3.7. thats on phantom 4 drone :/ dont have external balancer... dont know what to do... deep discahrge dont help... when I charge with DJI charger after hour it gives overvoltage protection LED blinking...
9-11 05:18
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