I would not advise that, if the battery has swollen so that it no longer fits, then it's time to replace it. The "stiffness" that I've mentioned in previous postings is strictly the "snugness" that DJI builds into the battery so that little door is not the only thing holding the battery in place.
I have never seen a drone catch fire in flight, but about 10-years ago, I was at the local R/C Aero Clubs flying my plane. One of the members had a really nice Electric Unit and it started to smoke in flight. Before he could get it down, it exploded in flight like it had been hit with a SAM. Since it was balsa construction, it never made it to the ground in one piece, but fell in flaming pieces that required a couple of fire extinguishers (from member's cars) to put out the brush fires. Even after it hit, the battery was still spitting fire...
I know batteries are especially expensive and if it still holds a good charge, I would be hard pressed to dump it too. But remind yourself that your drone is even more expensive...