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18650 battery 4000mah panasonic, Cncool NCR18650B Best selling High capacity 18650 rechargeable battery 3.7V Li Battery for power bank|Rechargeable - AliExpress, Hi Power Panasonic Lithium 18650 Rechargeable Cell: 3.6V 3400mAh (12.24Wh) NCR18650B (0.93) - UN 38.3 Passed