IC protected for over-charge, over-discharge, short circuit, and current overflow of 3A+. Protruding top design, fits most torches. Reinforced steel plate bottom, highly efficient protective PCB design. This battery type can be used to replace a CR123A disposable battery in some torches. Never use 2 of these batteries when 1 X 18650 will do the job. Features: Measures only 34.4mm in height (+/-0.1mm) and 16.7mm in width IC protected for a) over-charge, b) over-discharge, c) short circuit, d) current overflow of 3A+ True protrude top design, fits most torches High discharge rate 3A+ Nominal voltage: 3.7V, 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 Specifications: Battery Size: RCR123A (16340) Voltage: 3.7V, charge up to 4.2V Capacity: 650mAh Diameter: 0.65" (16.6mm) Height: 1.37" (34.8mm) Weight: 0.62 oz (17.8g)