Replacement battery fits 12 BIG BEAM compatible models. Specifications: 800mAh, 7.2V, Ni-Cd. Compatible with: ECHL1RWW, ECHL2RWW, ERXL1WGCS, ERXL1WRCR, EVRXL2GWWU, EVRXL2RWWU and 6 more compatible models. Replaces: BIG BEAM N71F, BIG BEAM 3YAJ7, BIG BEAM 118-0017, BIG BEAM OSA026. BIG BEAM replacement battery designed for Emergency Lighting devices. Dependable performance you can count on.