BATTERIES
Primary Zinc Alkaline (most common) Lithium (camera, watch) Secondary (rechargeable) Sealed lead acid (car) Gel NiCd NmHd Lithium. Important specs Energy density Voltage Zinc/Alkaline: 1.5 V Lead Acid: 2.0 V cars: 6, 12 V NiCd: 1.2 V Power tools: 4.8, 6.0, 7.2, 9.6, 12, 18 V
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