Just a thought. You might consider the battery as a "shop only battery" to be used only when you need to power up and not fly, such as firmware upgrades, camera checks and the like.
As per your flight experiment over the mattress, it seems it's stable enough to do just that.
Can you make a youtube video of that? This would be much appreciated by all.Don't try to get the Lipo back to Life... It doesn't help...
If you want to sell the pack in total... pls send me a mail... There is only one chance : disassemble the pack, desolder the Lipo from the PCB and insert a new Lipo
If I would have the battery pack......Can you make a youtube video of that? This would be much appreciated by all.