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Demonfire IMR 18650 button-top batteries are high-performing, long-lasting rechargeable batteries designed to pack a punch while being safe and reliable. Specifications: • Capacity: 2000mAh • Nominal Voltage: 3.7V • Continuous Discharge Current: 15A • Max Discharge Current: 30A • Dimensions: 65.5±0.5mm Length, 18.5±0.2mm Circumference • Operating Discharge Temperature: -20 to 60 Degrees Celsius • Standard Charge: 0.2C CC/CV to 4.2V, current ≤ 0.01C cut-off • Cycle Life: 300 cycles • Weight Per Battery: 39.5g Charger Information: The Demonfire D1 battery charger is perfect for charging 3.7V IMR, Lithium-Ion, or LiFePO4 batteries. Indicator lights on the charger show when batteries are fully charged. The compact size is great for traveling or on-the-go charging. Specifications: • Compatible with the following IMR/Li-ion/LiFePO4 batteries: 18650, 18500, 18490, 18350, 17670, 17500, 16340, 14500, 10440 • 4.2V for lithium batteries and 3.0V for LiFePO4 batteries • DC input port size: 3.5mm x 1.35mm • Input: AC 100-240V 50/60Hz 0.2A, DC 8-12V 1A • Output: 3V 0.5A, 4.2V 0.5A Package Includes: • 2 Brand New Demonfire 18650 2000Mah Button-Top Batteries • 2 Dual Battery Cases (holds up to 4 batteries total) • 1 Brand New Demonfire D1 Battery Charger