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Chemical energy converted to electrical energy through electro-chemical reaction
 Primary Battery |
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Battery which is not rechargeable (ex: Manganese Battery, Alkaline Battery)
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| Rechargeable Battery |
Battery which is rechargeable through charging (ex: Ni-cd Battery, Ni-MH Battery, Lithium-ion Battery, Lithium-metal Battery, Lithium-polymer Battery)
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| Fuel Cell |
Battery which can be continuously used when provided with fuel; i.e. Tertiary Battery
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Electricity generator using physical reaction such as photoelectric effect
| Solar Energy |
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Electricity generator converting physical energy of the sunlight to electric energy
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