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Product Details 18650 3.7v Rechargeable Battery: Voltage: 3.7V Storage Voltage: 3.7-3.9V Charging Cut-off Voltage: 4.25V Discharge Cut-off Voltage: 3.0V Capacity: 3000mAh Norminal Capacity: 3000mAh Size: 18.0*65.0mm Weight: 46g Battery top: Flap top Material: Lithium Li-ion Recharging cycles: At least 1000cycles Pakage include: 2PCS 18650 Rechargeable 3.7V 3000mAh Lithium Li-ion Battery Caution: Never completely discharge li-ion battery ( below 2.5V under load ). Never use force to install (insert) li-ion battery. Do not use old and new battery cells together. Do not expose to heat. Do not short (connect) positive (top), and negative (bottom) battery terminals (contacts). Keep battery that is not in use in plastic holder (or any insulating [plastic] container). Never charge battery over 4.25V (another reason to use high quality battery charger). Do not charge unattended. Do not store your li-ion batteries fully charged (for extended period of time). Store in cold and dry place at approximately 3.7V (storage charge).