The battery was upgraded last minute before shipping

• The battery was upgraded last minute before shipping
• It mostly fit, but there was no room for expansion
• Manufacturing used 2 different battery manufacturers, one had batteries that were ever so slightly more thick
• Some batteries expanded into a screw or other scrap metal left by other shoddy manufacturing
• which breached the protective envelope
• which in turn allowed the lithium to react with the air
• and happily burn
• NOT PROFIT!

Remember those Samsung Note 7s that self ignited?