Is there a safe method to revive dead Li-ion batteries?
They may be worthless now, but if you put series R’s to each cell to supply 200mW charge max from 1 to 3.8V or 4Vmax , you might recover $8 worth charge left or more if recently dead. You can compute the R value right?? If not V^2/P=R or 9/.2= 45 Ohms... choose 50. 1/4W. X16 pcs Then monitor voltage drop or Vbat rise vs time and record. 

Then discharge and do same. Then safely toss any that are &lt;10% of rated capacity only use match ones. If V does not rise. Then damaged but at least no more than they wont get hot. 

Thermal sensing is advised in future use. And don’t drain lower than 3V and don’t use more than 1C rates on these if in the unlikeliest event that they return to life.