(FR2732511-A1)       The 6V, 120Ah battery has its casing (2) divided into compartments (9) by sidewalls (12). Positive and negative terminals (6,7) are carried on the cover (3). The material of the casing is a blend of polyaminocaprolactam (-NH-(CH2 )5 -CO-)n or another polyamide (-NH-(CH2 )6 -NH-CO-(CH2 )4 -CO-)nwith preferably 20 to 50 wt.% of either polyethylene, polypropylene or a copolymer.     The permeability to H2 is 400 cm3 /m2 /day measured at 25 C on a 100 m film under absolute pressure of 2 bars and relative humidity 75%. Permeability to O2 is 150 cm3 /m2/day measured in the same conditions.    ADVANTAGE -    High energy storage density is combined with improved sealing to both O2 and H2.    (JP8287884-A)       The 6V, 120Ah battery has its casing (2) divided into compartments (9) by sidewalls (12). Positive and negative terminals (6,7) are carried on the cover (3). The material of the casing is a blend of polyaminocaprolactam (-NH-(CH2 )5 -CO-)n or another polyamide (-NH-(CH2 )6 -NH-CO-(CH2 )4 -CO-)nwith preferably 20 to 50 wt.% of either polyethylene, polypropylene or a copolymer.     The permeability to H2 is 400 cm3 /m2 /day measured at 25 C on a 100 m film under absolute pressure of 2 bars and relative humidity 75%. Permeability to O2 is 150 cm3 /m2/day measured in the same conditions.    ADVANTAGE -    High energy storage density is combined with improved sealing to both O2 and H2.    (US5800945-A)       The 6V, 120Ah battery has its casing (2) divided into compartments (9) by sidewalls (12). Positive and negative terminals (6,7) are carried on the cover (3). The material of the casing is a blend of polyaminocaprolactam (-NH-(CH2 )5 -CO-)n or another polyamide (-NH-(CH2 )6 -NH-CO-(CH2 )4 -CO-)nwith preferably 20 to 50 wt.% of either polyethylene, polypropylene or a copolymer.     The permeability to H2 is 400 cm3 /m2 /day measured at 25 C on a 100 m film under absolute pressure of 2 bars and relative humidity 75%. Permeability to O2 is 150 cm3 /m2/day measured in the same conditions.    ADVANTAGE -    High energy storage density is combined with improved sealing to both O2 and H2.    (EP736916-B1)       The 6V, 120Ah battery has its casing (2) divided into compartments (9) by sidewalls (12). Positive and negative terminals (6,7) are carried on the cover (3). The material of the casing is a blend of polyaminocaprolactam (-NH-(CH2 )5 -CO-)n or another polyamide (-NH-(CH2 )6 -NH-CO-(CH2 )4 -CO-)nwith preferably 20 to 50 wt.% of either polyethylene, polypropylene or a copolymer.     The permeability to H2 is 400 cm3 /m2 /day measured at 25 C on a 100 m film under absolute pressure of 2 bars and relative humidity 75%. Permeability to O2 is 150 cm3 /m2/day measured in the same conditions.    ADVANTAGE -    High energy storage density is combined with improved sealing to both O2 and H2.