Key Specifications/Special Features: High energy density Flexible in mechanical dimension Wide temperature range: -20 - 60 deg. C Long cycle life 2.7V-4.2V operation Low internal impedance High rate discharge current Customized design Safety and environment friendly Nominal capacity: 640mAh Nominal voltage: 3.70V Impedance: < = 45 mohms Charging voltage (approx.): 4.2 +/- 0.05V Discharging current (max): 1280mAh Dimensions (T, W, H) (3): (3.7 +/- 0.2) x (33.5 +/- 0.5) x (50.5 +/- 0.5) mm Cycle life: > 400 cycles Self-discharge: < 8% per month Operating temperature range: Charge: 0 - 45 deg. C Discharge: -20 - 60 deg. C Energy density: Energy density Weight: 185Wh/kg Weight (max): 14.5 +/- 0.5g Primary Competitive Advantages: Quality Approvals Service