NOVELTY - A battery pack (101) with integrated hazard mitigation system comprises metal-air cells (603), non-metal-air cells (605), 1st air passageway (803), 2nd air passageway (805), and 1st valve (804, 806, 809, 813) which controls air flow through 1st air passageway and consists of 1st position that permits air flow and 2nd position that prevents air flow, wherein 1st valve is in 1st position during normal operation of battery pack and configured to switch to 2nd position upon occurrence of thermal event within greater than or equal to 1 of the non-metal-air cells.    USE - A battery pack with integrated hazard mitigation system for electric vehicles e.g. all-electric vehicle (EV), plug-in hybrid electric vehicle (PHEV), or hybrid electric vehicle (HEV).    ADVANTAGE - Risk of spontaneous combustion is eliminated or greatly reduced, and collateral property damage is limited.    DETAILED DESCRIPTION - A battery pack (101) with integrated hazard mitigation system comprises metal-air cells (603), non-metal-air cells (605), 1st air passageway (803), 2nd air passageway (805), and 1st valve (804, 806, 809, 813) which controls air flow through 1st air passageway and consists of 1st position that permits air flow and 2nd position that prevents air flow, wherein 1st valve is in 1st position during normal operation of battery pack and configured to switch to 2nd position upon occurrence of thermal event within greater than or equal to 1 of the non-metal-air cells. Switching 1st valve from 1st position to 2nd position causes effluent generated by thermal event to pass through the metal-air cells before passing through 2nd air passageway. An INDEPENDENT CLAIM is included for method of mitigating the effects of thermal event within a battery pack (101).    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional diagram of metal-air battery pack and conventional battery pack with a duct interposed between the 2 packs.    Metal-air battery pack (101)    Metal-air cells (603)    Non-metal-air cells (605)    1st passageway (803)    2nd passageway (805)