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Swollen Mavic 2 Pro batteries have self healed!
5250 29 2020-8-26
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AIRQUAD
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In April this year I noticed that three of my M2P batteries (charged about 60 times) were swollen, so didn’t use them anymore.
  
Last week I checked them out and noticed that the swelling was gone, so I charged them all and flew them down to 30%, and recharged them again, still no swelling.
Apparently they have self healed, thats the only explanation I can think of right now.
  
So don’t throw away your swollen battery, store them for a couple of months and charge them again and se that happens.
  
Does anyone here have a similar experience?

2020-8-26
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Ex Machina
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I had two swollen Mavic Pro batteries that I kept for a month and a half before disposing and they stayed swollen. My remaining battery has once swollen very slightly while hot but returned to normal after cooling off and I haven't noticed any more episodes of swelling after charging, so ¯\_(ツ)_/¯ .

Just to be clear, my swollen batteries were really swollen, to the point where it was difficult to attach/remove from the AC.

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2020-8-26
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A J
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Interesting find mate - thanks for sharing
2020-8-26
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AIRQUAD
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Ex Machina Posted at 8-26 05:00
I had two swollen Mavic Pro batteries that I kept for a month and a half before disposing and they stayed swollen. My remaining battery has once swollen very slightly while hot but returned to normal after cooling off and I haven't noticed any more episodes of swelling after charging, so ¯\_(ツ)_/¯ .

Just to be clear, my swollen batteries were really swollen, to the point where it was difficult to attach/remove from the AC.

Thanks for your input, my batteries looked like that to.
2020-8-26
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Ex Machina
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AIRQUAD Posted at 8-26 05:14
Thanks for your input, my batteries looked like that to.

Huh. DJI has stated that moisture can cause swelling, presumably via micro (or otherwise) cracks in the battery casing. Is it particularly arid in your part of the world right now? Maybe if there is a way you can remove moisture from affected battery cells they can return to normal size?
2020-8-26
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DJI Stephen
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Hello there AIRQUAD. Thank you for reaching out and for sharing these information with us here at DJI Forum. Battery swelling is basically caused by to much heat, vast changes in temperature and/or moisture getting into the battery itself. The lifespan and condition of the battery will depend on the totality of how it was used and stored. In addition, every electronic product and batteries has a certain warranty period and lifespan. For safety purposes please do not use bloated or bulging batteries when flying or operating your drone so that the drone's performance will not be affected or compromised . Using bloated or bulging batteries might lead to damaging of the aircraft, or worse, damage to property. Thank you.
2020-8-26
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DAFlys
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Perhaps the lithium bag burst letting the pressure out,  I'd not feel comfortable flying these batteries.  I know the batteries are not cheap but compared to replacing the drone they are.
2020-8-27
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AIRQUAD
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Ex Machina Posted at 8-26 05:50
Huh. DJI has stated that moisture can cause swelling, presumably via micro (or otherwise) cracks in the battery casing. Is it particularly arid in your part of the world right now? Maybe if there is a way you can remove moisture from affected battery cells they can return to normal size?

I didn’t know what.
The winter here was very mild and moist and I flew very much in January – April and then I discovered the swelling.
2020-8-27
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AIRQUAD
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DJI Stephen Posted at 8-26 19:02
Hello there AIRQUAD. Thank you for reaching out and for sharing these information with us here at DJI Forum. Battery swelling is basically caused by to much heat, vast changes in temperature and/or moisture getting into the battery itself. The lifespan and condition of the battery will depend on the totality of how it was used and stored. In addition, every electronic product and batteries has a certain warranty period and lifespan. For safety purposes please do not use bloated or bulging batteries when flying or operating your drone so that the drone's performance will not be affected or compromised . Using bloated or bulging batteries might lead to damaging of the aircraft, or worse, damage to property. Thank you.

So if a battery swelled once but vent back to normal it not safe to use?
2020-8-27
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AIRQUAD
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DAFlys Posted at 8-27 04:54
Perhaps the lithium bag burst letting the pressure out,  I'd not feel comfortable flying these batteries.  I know the batteries are not cheap but compared to replacing the drone they are.

Maybe so, I’m going to do some more test flights and monitor the batteries closely.
2020-8-27
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DAFlys
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AIRQUAD Posted at 8-27 06:15
Maybe so, I’m going to do some more test flights and monitor the batteries closely.

Maybe keep those flights under 8ft.
2020-8-28
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KlooGee
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Three of my swollen batteries have deflated after about 2 months of removing them from use.  I’ve not had the cajones to try them out again though.
2020-8-28
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AIRQUAD
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DAFlys Posted at 8-28 00:56
Maybe keep those flights under 8ft.

Yes that’s perhaps the safest way to do it, and with additional safety measure added.

2020-8-28
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AIRQUAD
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KlooGee Posted at 8-28 01:16
Three of my swollen batteries have deflated after about 2 months of removing them from use.  I’ve not had the cajones to try them out again though.

Thank for your input KloGee, it’s probably best not to use them.
2020-8-28
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DJI Stephen
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AIRQUAD Posted at 8-27 06:12
So if a battery swelled once but vent back to normal it not safe to use?

Hi there AIRQUAD. Thank you for the reply and for the information you have shared. If the said battery swelled once but went back to normal. It would be best to observe the said battery when in use specially when flying your DJI drone just to be sure that there will be no unwanted incident that happened. Thank you.
2020-8-30
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DAFlys
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AIRQUAD Posted at 8-28 20:38
Yes that’s perhaps the safest way to do it, and with additional safety measure added.

[view_image]

Im still not sure its worth the risk.
2020-8-31
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UKMoose
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AIRQUAD Posted at 8-28 20:38
Yes that’s perhaps the safest way to do it, and with additional safety measure added.

[view_image]

Hi Airquad
I do exactly the same thing with velcro for a Mavic pro battery with one catch that's broken off. No problem at all.
2020-8-31
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AIRQUAD
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DAFlys Posted at 8-31 05:59
Im still not sure its worth the risk.

Well I’ll  report back how it turns out  
2020-8-31
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AIRQUAD
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UKMoose Posted at 8-31 06:28
Hi Airquad
I do exactly the same thing with velcro for a Mavic pro battery with one catch that's broken off. No problem at all.

Thanks for your input UKMoose
2020-8-31
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AIRQUAD
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DJI Stephen Posted at 8-30 23:59
Hi there AIRQUAD. Thank you for the reply and for the information you have shared. If the said battery swelled once but went back to normal. It would be best to observe the said battery when in use specially when flying your DJI drone just to be sure that there will be no unwanted incident that happened. Thank you.

Thanks for your input  Stephen
2020-8-31
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Ex Machina
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AIRQUAD Posted at 8-28 20:42
Thank for your input KloGee, it’s probably best not to use them.

Besides the risk of battery failure while in flight, there's also a fire risk: Bloated Battery Catches FIRE.
2020-9-1
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AIRQUAD
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Ex Machina Posted at 9-1 04:42
Besides the risk of battery failure while in flight, there's also a fire risk: Bloated Battery Catches FIRE.

Very scary indeed
2020-9-1
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DJI Stephen
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AIRQUAD Posted at 8-31 23:49
Thanks for your input  Stephen

Hi there AIRQUAD. You are very much welcome and if you have any other inquiries or concerns with DJI. Please feel free to post it here at DJI Forum. We are all here to help and support you. Have a safe and a happy flying always.
2020-9-1
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bjr981s
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LiPo batteries swell as they give off a gas. This is normally contained within the battery wrappings. If the gas leaks out you will determine that the batteries have returned to normal size. But they have not returned to normal operation. They will have lost some storage capability. That is up to you to determine.
2020-9-2
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Craig540
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DJI Stephen Posted at 2020-9-1 22:08
Hi there AIRQUAD. You are very much welcome and if you have any other inquiries or concerns with DJI. Please feel free to post it here at DJI Forum. We are all here to help and support you. Have a safe and a happy flying always.
Has DJI corrected this problem with Mavic 2 batteries?
I have 2 batteries that are useless after 50 fights each and do not want to buy more defective batteries.  
2021-8-27
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NickelPlate
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bjr981s Posted at 2020-9-2 04:45
LiPo batteries swell as they give off a gas. This is normally contained within the battery wrappings. If the gas leaks out you will determine that the batteries have returned to normal size. But they have not returned to normal operation. They will have lost some storage capability. That is up to you to determine.

Yep. Been using lipos for many years. If they're swollen from gas build up they usually stay that way unless they have a leak in the foil wrapper. That's a dangerous situation as lithium reacts with H20 violently. Never vent them yourself. As hard as it is to do, I would discard the battery.
2021-9-1
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djiuser_bjhaINqX18Tl
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I lost my drone due the the swollen battery that came out! The biggest flaw in the DJI design is the battery's.
2021-12-31
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djiuser_bjhaINqX18Tl
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I lost my drone due the the swollen battery that came out! The biggest flaw in the DJI design is the battery's.
2021-12-31
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AntDX316
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According to the logs.. one of my batteries has massive cell deviation and probably is the that had a lot of voltage issues in flight but everything looks ok.  It doesn't look inflated at all.  It doesn't seem too bad..

1.png
I don't understand how in the beginning it gets down to 3.2V but mid-flight.. it's normal?  Look at 6 minutes in.

2.png

Is this something I should worry about?  I would have zero idea if I didn't go into advanced mode with a payment subscription to be able to see it.



2021-12-31
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djiuser_lCQXVP5XktfV
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I purchased a bloated Mavic 2 battery by accident. It was cheap and I paid $100 for 2 pieces. I did not fly my mavic for 6 months and I later realised they were no longer bloated. I have been using them regularly ever since with no problems. However, I have a habit of always letting the battery cool down before charging it and my low battery alert is 35% so that the heat does not go beyond a certain threshold..
1-6 18:06
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