Vital watch and calculator battery 379 gives your compatible specialty devices such as watches, calculators and medical devices long-lasting power. Vital batteries are tested for their lasting power and efficiency, so you won’t need to worry about constant replacements. This battery is generally used to replace s56, sr521sw, sp379, rw327, 50, tr521sw, tr521sw, 520, 8073, d379, 379, 1191s0, type ja, v379, 613, 379x, 379f type batteries.