If that is the case, why would you ever tell the insurance company that it was slightly swollen before flight? It would otherwise be impossible for them to prove!
Don't deny your own claim. LOL!
It was the charger and not the battery that "failed."
It was also not a DJI charger, nor a DJI battery.
Dude has literally hundreds of LiPo batteries over many years and had a single charger fail only once.
It can happen, but it is clearly more...
As others have advised, these are done. Properly dispose of them.
Any swelling AT ALL indicates hydrogen gas is being produced during normal discharge. This only happens when one or more cells is compromised. There is a very real...
I think it's better to get them down from 100% sooner rather than later. When they are at 100% the chemical reaction that degrades them happens faster. 3 years sounds about right for a battery that was kept at full charge to start bulging.
Also...