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3.6 v battery, Amazon.com: 2XEEMB ER26500 nonrechargeable 3.6V Lithium Battery Li-SOCL₂ C Size 9000mAh High Capacity UL Certified Single-Use 3.6V Lithium Thionyl Chloride Battery NOT Battery : Health Household, Saft 3.6V 14500 Lithium - LITHLS14500BA at Plus