A standard LiPo (HV or normal) can be 'jolted' to start charging - but you need to use non LiPo methods to do it ... and extreme care ...
DJI have prevented us the owners from accessing the battery itself - so many of the LiPo tricks you learn as the 'knowledge grows' cannot be used ... some say Good - as that stops idiots and protects DJI !
If you have access to a Programmable LiPo charger ... then I am willing to pass on a few 'tricks' via PM ... but not publicly here on the thread. I will not be accused of teaching bad ways ....
Generally if the LiPo is dead .. its DEAD DEAD DEAD !!
Puffy has nothing to do with it ... that just shows that internal gassing has occurred usually due to too high a demand or damage to battery cells. In fact you can have a puffed cell and still have reasonable use out of it ... BUT you better keep a close eye on it !! (I fly EDF's and high speed record breakers ... puffing is an accepted problem !)
Nigel