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Emergency lighting fixtures which utilize Nickel-Cadmium Batteries offer a number of advantages over older, traditional sealed lead-acid (or SLA) types. AA-sized nickel cadmium batteries have a fast recharge time and a near 15-year lifespan. NiCd is the only power cell that performs well under rigorous working conditions like cold and hot weather. Ni-Cd battery packs are also much lighter than SLA, which can save you a great deal on shipping costs.