Samsung INR18650-25R 2500mAh

Specifications:

• Flat Top 
• Nominal capacity: 2500 mah
• Max Continuous Rated Discharge: 20 amps (at 25 degrees C)
• Nominal voltage: 3.6v
• After a fresh charge: 4.2v
• Cycle info: Capacity drops to 60% after 250 full charge/discharge Cycles
• Don't discharge below: 2.5v
• Standard Charge: CC/CV @ 1 amp / 4.20 volts +/- .05v, 100 mA cut-off
• (Max) Rapid Charge: CC/CV @ 4amps / 4.20 volts +/- .05v, 100 mA cut-off
• Impedance: 22.15 +/- 2 milliohms
• Weight: 45g
• Height: 64.85 +/- 0.15mm
• Diameter: 18.33 +/- 0.07mm
• Operational Charging Temperature Range: 0 to 50 degrees C (best below 45 degrees C)
• Operational Discharging Temperature Range: -20 to +75 degrees C (best below 60 degrees C)
• You can store them for 1.5 years at -30 to + 25 degrees C, 3 months at 30 to 45 C and 1 month at 30 to 60 C (in other words, store them in a cool place and they'll last longer)