3 batteries from Fly more bundle. About 15 months old. Charged regularly, every other week (or after flights). Latest firmware. Were idle (not used, just rechanged) since May 2019 till recently. They work and still fit (although not perfectly), but I'm worried.
Any known cure? Or need to bite the bullet and get new ones?

Never store LiPos fully charged. Bite the bullet...

Check with dji support first many have got batteries replaced

Hi, thank you for reaching out and we're sorry to know the problem with your batteries. I will highly recommend you to contact our support team at https://www.dji.com/support to conduct a damage assessment with your batteries also to find out the reason for the problem. A corresponding resolution will be provided via email once we receive your batteries. Please don't hesitate to reach us if you have other inquiries or concerns. Thank you for your understanding and support!

DJI Gamora Posted at 2-6 08:44
Hi, thank you for reaching out and we're sorry to know the problem with your batteries. I will highly recommend you to contact our support team at https://www.dji.com/support to conduct a damage assessment with your batteries also to find out the reason for the problem. A corresponding resolution will be provided via email once we receive your batteries. Please don't hesitate to reach us if you have other inquiries or concerns. Thank you for your understanding and support!

Thank you. Sent them an email.

Don't forget to discharge the batteries to 30% before shipping. Also make sure there is a sticker on the shipment that shows that the box contains Lipo batteries. Never ship fully charged Lipos, they are dangerous.

Wow, hopefully this is not an occurring problem.

Storing charged Lipos time and time again for 15 months.....?    I am surprised they didn't puff before now.

The auto discharge is there to HELP.....Not be the standard.  Fly your batteries....and leave them between 30 and 50% for storing for weeks at a time.  They will last longer.

DO NOT CHARGE following a flight, then leave them to auto discharge......

Randy

rwynant V1 Posted at 2-7 14:36
Storing charged Lipos time and time again for 15 months.....?    I am surprised they didn't puff before now.

The auto discharge is there to HELP.....Not be the standard.  Fly your batteries....and leave them between 30 and 50% for storing for weeks at a time.  They will last longer.

Well, here is my problem with that suggestion.
I almost never know when my next flight would be. Sometimes I do, but not often. And when I need to fly, I normally have minutes, maybe half an hour to prep.  Which, unfortunately, dictates that I have to have my batteries ready at all times, as I won't have time to change them on demand.
So, yeah...

Update: got email for DJI support stating that warranty is for 6 months, so I'm SOL. They also asked for additional information which I might provide.
Now the question is is whether I shall wait next for next Mavic, or just replace these...

Darth,  I completely Understand
My 4Pro V2/V1 has 7 batteries.....I always have 1 or 2 fully charged, and my M2Pro has 6 batts....2 are always charged.....I cycle them.....and always have 2 charged and ready to go AND have charge capability to charge 3 batteries on the fly.....

Planning, cycling, being ready.....it is our responsibility, and WE need to know how our batteries will respond!!
Randy

rwynant V1 Posted at 2-7 20:13
Darth,  I completely Understand
My 4Pro V2/V1 has 7 batteries.....I always have 1 or 2 fully charged, and my M2Pro has 6 batts....2 are always charged.....I cycle them.....and always have 2 charged and ready to go AND have charge capability to charge 3 batteries on the fly.....

Thanks! I have the same thing going with my 8 dslr batteries. I guess I do need to be more careful with the next set.

You can leave them fully charged, just plan on replacing them every year.

DarthSLR Posted at 2-7 09:47
Thank you. Sent them an email.

You're welcome!

The real question, what is DJI doing to solve their battery bloating issue? Users continue to have battery problems.

MRomine Posted at 7-22 17:40
The real question, what is DJI doing to solve their battery bloating issue? Users continue to have battery problems.

Hi, What is the manufacturing date on your battery. Going back in time here in the forum, this was a problem with batteries manufactured around 2018 and 2019 and then later I think DJI may have done some improvement, as this problem seams to have stopped in the last year or so.
You can check your batteries manufacturing date here by putting in the serial number:  http://tools.retroroms.info/

kyalami Posted at 7-23 00:46
Hi, What is the manufacturing date on your battery. Going back in time here in the forum, this was a problem with batteries manufactured around 2018 and 2019 and then later I think DJI may have done some improvement, as this problem seams to have stopped in the last year or so.
You can check your batteries manufacturing date here by putting in the serial number:  http://tools.retroroms.info/

The one that came with the drone is 12/2018 the other two that came with the fly more kit are 03/2019.

MRomine Posted at 7-23 03:50
The one that came with the drone is 12/2018 the other two that came with the fly more kit are 03/2019.

Yes, looking back here in the forum, these older dates seams unfortunately to be the one that had swelling problems if my memory serves me right. I have not seen any recent batteries yet that have this problems. So I therefore thought that DJI may have improved the batteries.