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The Watson BP-31 / SLB-1237 / EU-94 Lithium-Ion Battery Pack works with the same cameras as the Sigma BP-31, Samsung SLB-1237 and Epson EU-94. This replacement battery pack features a capacity of 950mAh, 3.7V of output power and 3.5 watt-hours. Small and lightweight, lithium-ion batteries can be charged or discharged at any time without developing memory effect.