Product Details Smart Battery Charger: It is with high efficiency and reliability! High Quality 2 Slots Charger for 18650 Battery. Quick charge with automatic constant current control prevents battery from overcharging, short circuit, and electronic shock. Input Voltage: AC 100V - 240V 50 / 60Hz Max150mA Output Voltage: DC 4.2V 650mA Rechargeable Time Limit: About 12 hours Dimensions: 1.73" x 1.26" x 3.27" (L x W x H) 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: 2500mAh Norminal Capacity: 2500mAh Size: 18.0*65.0mm Weight: 46g Battery top: Flat top Material: Lithium Li-ion ICR Recharging cycles: At least 1000cycles Appliations: Flashlight,headlamp,lantern,LED light,dive light,green laser,fan,headlight,torch,laser pointer,mechanical box mod and so on Pakage include: 4PCS 18650 Flat Top Rechargeable 3.7V 2500mAh Lithium Li-ion Battery, 1PCS Four Channels Fast Li-ion Battery Charger 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 use old, and new cells together. 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).
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