'- Uses newest Sanyo 3500mAh Li-ion/NCR18650GA Cell, Made in Japan. - This is the shortest ultra high capacity 18650 ever made WITH TRUE Button top! - Measures only 67.8mm in height and 18mm in width. - IC protected for a) over-charge, b) over-discharge, c) short circuit, d) current overflow of 10A - True protrude/BUTTON top design, fits/functions all flashlights. - High Discharge Rate 10A - Nominal Voltage: 3.6V, charge up to 4.2V, use CC/CV charger to charge. - Reinforced Steel Plate Bottom, highly efficient protective PCB design. - Packaged in individual box and anti-static bag. - Weight approx 1.8 ounces