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Multiple 18650 battery cells are used to make a 18650 battery pack, either connected in series or parallel configuration.

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Buy Wholesale China Cost-effective China Sunpower 18650 2200mah 11a 3.7v Rechargeable Lithium Ion Battery For Flashlight & Lithium Battery at USD 1.05

Protected Button Top 3500mAh Li-ion 3.7V Rechargeable Orbtronic 10A Dual Protection (Panasonic-Sanyo inside) Battery Case Included, Best 18650

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