18650 Battery 3.70V 4000mah Rechargeable Lithium-Ion Battery

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18650 Battery 3.70V 4000mah Rechargeable Lithium-Ion Battery With Lithium Battery Charger

18650 Battery 3.70V 4000mah Rechargeable Lithium-Ion Battery 

18650 Battery 3.70V 4000mah Rechargeable Lithium-Ion Battery

NO. Item Specifications
4.1 Typical Capacity 4030mAh          @ 0.2C Discharge
Minimum capacity 3950mAh          @ 0.2C Discharge
4.2 Nominal voltage 3.7V
4.3 Standard Charge CC/CV,0.2C5A, 4.20V
4.4 Standard Discharge CC,0.2C5A, 2.75V
4.5 End-of-charge  Voltage 4.20V±0.05V
4.6 End-of-charge Current 0.01C5A (At CV mode)
4.7 End-of-discharge Voltage 2.45 V
4.8 Charging Time 8.0hours(standard charge)
4.9 Quick Charge Current 4000mA (1.0C5rate)
4.10 Quick Discharge Current 8000mA (2.0C5rate)
4.11 Max Discharge Current 40000mA (10.0C5rate)
4.12 Initial Impedance Max:20mW
4.13  Weight Approx:43.5±2g
4.14 Operating temperature Charging:  0℃~45℃


4.15 Storage temperature -5℃~35℃
4.16 Storage Humidity ≤75% RH
4.17 Appearance Without scratch, distortion, contamination and leakage
4.18 Standard environmental condition Temperature            : 25±5℃

Humidity              :  45-75%RH

Atmospheric Pressure   : 86-106 KPA

4.19 Temperature Dependence of Discharge Capacity

@ 0.2C Discharge

Charge  temperature Discharge  temperature
25℃ -10℃ 0℃ 15℃ 25℃ 40℃
Relative Capacity 50% 80% 90% 100% 80%

Because superconductors can sustain very large currents, they can store a lot of energy in a relatively small volume. But even superconducting materials cannot sustain limitless electrical currents, and they can lose their special properties above a critical current density, which is in excess of 10 mega-amperes per square centimeter for state-of-the-art superconducting cables. By comparison, copper can carry a maximum current density of 500 amperes per square centimeter, which is same as the current density passed through a 100-watt tungsten wire light bulb.

While these critical currents where superconductivity turns off are known, what happens at the nanoscale inside the material as its approaches that critical condition is still unknown, yet it might hold the key to engineer better superconducting cables and devices, with even higher resilience.

Comin was one of three MIT researchers to win a U.S. Air Force Young Investigator Research Program grant this fall. The three-year, $450,000 award will allow Comin to pursue research into what happens to one particular superconducting material, yttrium barium copper oxide (YBCO) when it is driven at large currents.

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