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Slight battery swelling post-flight

Chuckinay

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I've started to notice very subtle battery swelling after my M2P flights — a barely perceptible bulge on the battery's bottom, which recedes after the battery cools. Pre-flight, the battery will look completely normal, with a perfectly flat bottom. Post-flight you can see the slight swelling. I have three batteries — each with 50-100 cycles and each about 2 years old — and all three are doing this post-flight.

I'm aware of the potential problem here — battery detachment and crash — and know about the historical record of the Mavic's swelling batteries. But this swelling is very minor and I'm not even sure they haven't been doing this all along.

Is this:

[ ] Normal, you just didn't notice it before.

[ ] A sign of impending doom and you should replace them immediately.
 

old man mavic

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@Chuckinay you have already answered your own question, and the decision you make as to whether or not you keep flying your drone with them is entirely yours to make ,no one on this forum is going to tell you one way or the other as we all know the consequence's of what could happen to the drone, if the batteries did become detached, sorry to be so blunt ,but i believe that honesty is the best policy here ,hence my answer
 
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Chuckinay

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@Chuckinay you have already answered your own question, and the decision you make as to whether or not you keep flying your drone with them is entirely yours to make ,no one on this forum is going to tell you one way or the other as we all know the consequence's of what could happen to the drone, if the batteries did become detached, sorry to be so blunt ,but i believe that honesty is the best policy here ,hence my answer
Fair enough! Thanks.

In terms of buying replacements, does anyone have any advice as to where to buy? Would it be best to go with the DJI Store so as to get something that hasn't been sitting around the stock room? Are they even still making these batteries?
 

old man mavic

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@Chuckinay genuine DJI replacements from a registered DJI dealer, beware of cheap alternatives on web sites
 

Made2Phly

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If your risk tolerance is high, get a removable zip tie, and strap the battery down. At least then it won’t eject, which is the risk when the batteries swell
 
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TwoSticks

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Now thats how you get the full life out of a battery. Ha. I have been leaving my batteries out for a while before I pack them up or charge again to reduce the fatigue from heat.
 

JimWest

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Fair enough! Thanks.

In terms of buying replacements, does anyone have any advice as to where to buy? Would it be best to go with the DJI Store so as to get something that hasn't been sitting around the stock room? Are they even still making these batteries?
Before you buy, ask DJI to replace them. See previous posts where myself and others have gotten DJI to replace two-year-old batteries for free because of swelling.
 

Chuckinay

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Thank you all. I've submitted a request for replacement. As I did an inventory, I learned the batteries were manufactured in December 2018 and April 2019, FWIW.
 

Chuckinay

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Postscript: DJI has agreed to replace the batteries.