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A battery pack includes a porous medium positioned in a case. The porous medium hold several batteries. The battery pack also includes terminals for accessing power from the batteries held by the porous medium. The terminals are accessible from outside of the case. The battery pack also includes a f

A battery pack includes a porous medium positioned in a case. The porous medium hold several batteries. The battery pack also includes terminals for accessing power from the batteries held by the porous medium. The terminals are accessible from outside of the case. The battery pack also includes a flame retardant absorbed into pores of the porous medium.

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1. A battery pack, comprising: a porous medium positioned in a case;batteries being held by the porous medium;terminals for accessing power from the batteries, the terminals being accessible from outside of the case; anda flame retardant in pores of the porous medium. 2. The battery pack of claim 1,

1. A battery pack, comprising: a porous medium positioned in a case;batteries being held by the porous medium;terminals for accessing power from the batteries, the terminals being accessible from outside of the case; anda flame retardant in pores of the porous medium. 2. The battery pack of claim 1, wherein the batteries are connected in a plurality of parallel groups and a plurality of series groups, each parallel group including a plurality of the batteries connected in parallel;each series group connecting one of the batteries from each of the parallel groups in series. 3. The battery pack of claim 1, wherein the porous medium has a solid-liquid phase transition at a temperature less than a runaway temperature of the batteries. 4. The battery pack of claim 3 wherein the porous medium has a thermal conductivity greater than 1 W/mk and a melting point of less than 350° C. 5. The battery pack of claim 3, wherein the flame retardant is included in a liquid having an electrical conductivity less than 10−5 Scm−1. 6. The battery pack of claim 4, wherein the flame retardant is included in a liquid having an electrical conductivity less than 10−5 Scm−1. 7. The battery pack of claim 1, wherein the porous medium is a plastic. 8. The battery pack of claim 1, wherein plastics is a substituted or unsubstituted poly(phenylene sulfide). 9. The battery pack of claim 1, wherein the porous medium has a porosity greater than 5%. 10. The battery pack of claim 1, wherein the flame retardant has a boiling point between 80° C. and 160° C. at 1 atm. 11. The battery pack of claim 1, wherein the flame retardant has a heat of vaporization lower than 150 J/g at boiling point and 1 atm. 12. The battery pack of claim 1, wherein the flame retardant has a boiling point greater than 80° C. and less than a runaway temperature of the battery, the runaway temperature of the battery being determined from the self heating rate of the battery as generated from accelerated rate calorimetry. 13. The battery pack of claim 1, wherein the flame retardant is a perfluorocarbon. 14. The battery pack of claim 1, wherein the flame retardants is a fully or partially halogenated compound selected from a group consisting of alkanes, ethers, ketones, and amines substituted with one or more alkyl groups. 15. The battery pack of claim 14, wherein the flame retardant is represented by R′(C═O)R″ wherein R′ is a perfluoroalkyl group and R″ is a perfluoroalkyl group or an alkyl group. 16. The battery pack of claim 14, wherein the flame retardant is a perfluoroketone. 17. The battery pack of claim 14, wherein the flame retardant is dodecafluoro-2-methylpentan-3-one. 18. The battery pack of claim 14, wherein the flame retardant is an ether. 19. The battery pack of claim 18, wherein the ether is a perfluorocyclic ether. 20. The battery pack of claim 18, wherein the ether is represented by R′OR″ wherein R′ is a perfluoroalkyl group and R″ is a perfluoroalkyl group or an alkyl group. 21. The battery pack of claim 18, wherein the ether is a segregated hydrofluoroether. 22. The battery pack of claim 21, wherein the segregated hydrofluoroether is selected from a group consisting of: methoxy-heptafluoropropane, methoxy-nonafluorobutane, ethoxy-nonafluorobutane, perfluorohexylmethylether, and 2-trifluoromethyl-3-ethoxydodecofluorohexane. 23. The battery pack of claim 14, wherein the flame retardant is an amine substituted with one or more perfluoroalkyl groups. 24. The battery pack of claim 23, wherein the flame retardant is an amine substituted with three perfluoroalkyl groups. 25. The battery pack of claim 24, wherein the amine is selected from a group consisting of perfluorotripentylamine, perfluorotributylamine, perfluorotripropylamine and perfluoro-n-dibutylmethylamine. 26. The battery pack of claim 14, wherein the flame retardant is an alkane. 27. The battery pack of claim 26, wherein the alkane is a perfluoroalkane. 28. The battery pack of claim 27, wherein the perfluoroalkane is selected from a group consisting of perfluoropentane, perfluorohexane, perfluoroheptane, perfluoroctane, and perfluoro-1,3-dimethylcyclohexane. 29. The battery pack of claim 1, wherein the flame retardant is a phosphazene. 30. The battery pack of claim 29, wherein the flame retardant is a cyclic phosphazene. 31. The battery pack of claim 29, wherein the flame retardant is a halogenated cyclic phosphazene. 32. A battery pack, comprising: a porous medium positioned in a case, the porous medium including a substituted or unsubstituted poly(phenylene sulfide) and having a porosity greater than 20%;batteries being held by the porous medium, the batteries being connected in a plurality of parallel groups and a plurality of series groups, each parallel group including a plurality of the batteries connected in parallel and each series group connecting one of the batteries from each of the parallel groups in series;terminals for accessing power from the batteries, the terminals being accessible from outside of the case; anda flame retardant absorbed into pores of the porous medium, the flame retardant being a fully or partially halogenated compound selected from a group consisting of alkanes, ethers, ketones, and amines substituted with one or more alkyl groups.