This is off the CPSC website:
"Hazard: If a vent on the battery cell is damaged or compromised during use, the battery can explode and pose a laceration hazard to consumers.
Incidents/Injuries: Milwaukee Electric Tool Co. has received 35 reports of incidents, including 11 injuries from battery packs exploding while in use. Injuries include minor cuts, bruises and some hearing loss."
All I can tell you is, I've had Milwaukee cordless tools for several years and used them hard, even abused them sometimes. No problems with batteries except wearing out a few.
Somewhat over a million batteries are included in this action. 11 injuries reported. I bet GM wishes they could say that.
simple man in a complicated world