Mostly dead?

Of the 11 devices, 1 totally refused to power-up / turn-on.  I tried reading online about similar situations involving the Google Nexus, and found that MOST users with dead devices are able to “jump start” the battery with a short charging… followed by unplugging… counting to 15, plugging back in… and turning on the device.  This trick didn’t work.  I found another story of charging for 1 hour, and then doing the same… that didn’t work either.  I found another story whereby the owner dis-assembled the sealed Nexus, and disconnected the battery briefly... and this supposedly revived the device.   (“Whoo-hoo-hoo, look who knows so much. It just so happens that your friend here is only MOSTLY dead. There's a big difference between mostly dead and all dead. Mostly dead is slightly alive.” )   I decided AGAINST that idea, and … decided to return that 11th device.