Product Features: Button top batteries, the metal nub sticking out of the top is positive and negative is flat Fit for using in any product that puts 18650 batteries, like flashlights and other electronic devices, but not to be confused with 3.7V AA or AAA batteries three sets of overheating cell protection; Overcharge, over-discharge, overcurrent, short-circuit protection circuit Attention The batteries should be stored at room temperature, charged to about 30% to 50% of capacity. We recommend that batteries be charged about once per half 3 months to prevent over discharge Lithium batteries are not designed to be charged constantly like Ni-cads or Nimh batteries.. Several partial discharges with frequent recharges are better for lithium-ion than one deep one because there is no memory effect Do Not Recharge the batteries from the USB port on a device not designed especially for Li-ION batteries; Recommend charger: CIVICTOR AR-X1-LU that limit the charging voltage to 4.2 V Specifications Rating Voltage: 3.7V (battery cell volts: 3.6V) Charge Voltage: 4.200±0.049V Charging Current: 0.52A, the Max is 2.6A Charging Time: standard charging 0.2C (0.52A) to full is about 5 hours / Fast charging 1C (2.6 A) to full is about 2.5 hours Max Discharge Current: 1.5C (3900mAh) Discharge Cut-off Voltage: 2.70 ± 0.1V Operating Temperature: charging (0 degrees C ~45 degrees C) / discharge (-20 degrees C ~60 degrees C) Materials: steel hat by riveting process and steel shell (fully covered steel) Dimensions: L65 mm x D18.4 mm / 2.56 in x 0.72 in Weight : 55 g / 1.94 oz Inside the Box CIVICTOR 18650 rechargeable battery * 1; Stable Battery Storage Case * 1
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