Samsung ICR18650-30B li ion battery cell

The Samsung ICR18650-30A cell is very good 6A discharge 18650 Battery cells for usual application. It has max discharge current 6A, capacity can reach 3000mAh if charge it by 4.3v, this cell provides high capacity good performace at relatively unexpensive price. You can charge it with normal 4.2v charger and it will release capacity more then 2700mAh while you get better cycle life. Lygte-info conclusion"It has a more flat discharge curve /higher voltage at the last part of the discharge at any charge voltage.  It is a very good cell, but requires a 4.35V charger for best performance." 

Nominal Specifications 

3.1 Nominal Capacity 3000mAh (0.2C, 2.75V discharge) 
3.2 Minimum Capacity 2900mAh(0.2C, 2.75V discharge) 
3.3 Charging Voltage 4.3 ±0.03 V 
3.4 Nominal Voltage 3.7V 
3.5 Charging Method CC-CV 
(constant voltage with limited current) 
3.6 Charging Current Standard charge: 1500mA 
 Rapid charge : 3000mA 
3.7 Charging Time Standard charge : 3hours 
 Rapid charge : 2.5hours 
3.8 Max. Charge Current 3000mA(ambient temperature 25℃) 
3.9 Max. Discharge Current 6000mA(ambient temperature 25℃) 
3.10 Discharge Cut-off Voltage 2.75V 
3.11 Cell Weight 48.0g max 
3.12 Cell Dimension Height : 65.00mm max 
 Diameter : 18.25mm max 
3.13 Operating Temperature Charge : 0 to 45℃ 
 Discharge: -20 to 60℃ 
3.14 Storage Temperature 1 year : -20~25℃(1*) 
3 months : -20~45℃(1*) 
1 month : -20~60℃(1*) 

9. Safety 
 9.1 Overcharge Test 
 Test method: To charge the standard charged cell with 12V and 2.8A at 25℃ 
 for 2.5 hours. 
 Criteria: No fire, and no explosion. 
 9.2 External Short-circuit Test 
 Test method: To short-circuit the standard charged cell by connecting positive and 
 negative terminal by less than 50mΩwire for 3hours. 
 Criteria: No fire, and no explosion. 
 9.3 Reverse Charge Test 
Test method: To charge the standard charged cell with charge current 2.8A 
By –12V for 2.5 hours. 
 Criteria: No fire, and no explosion. 
9.4 Heating Test 
 Test method: To heat up the standard charged cell at heating rate 5℃ per minute up to 
 130℃ and keep the cell in oven for 60 minutes. 
 Criteria: No fire, and no explosion. 

Test with 4.35 volt charging

Samsung ICR18650 30b discharge curve 4.35V 1C

*Note: There is very small difference(can be considereable as the same cell) between 30A and 30B as below:

Samsung ICR18650-30A
Charge Voltage: 4.35V
Nominal Voltage: 3.7V
Discharge cut-off voltage: 2.75V
Capacity: 3000mAh
Max discharge current: 6A

Samsung ICR18650-30B
Charge Voltage: 4.35V
Nominal Voltage: 3.78V 
Discharge cut-off voltage: 2.75V
Capacity: 2950mAh
Max discharge current: 5.9A