Item

Measuring Procedure

Standard

1.Appearance

Visual check

Clean, unscratched and clearly labeled

2.Dimenaions

Measured by calipers with precision of 0.02mm

φ 17.0× 50.5mm max

3.Weight

Weighed by balance with precision of 0.1g

27g max

4.Open-circuit voltage

Measure by volt-meter with precision of 0.01V

≥ 3.65V

5.Operating voltage

Measure by volt-meter with precision of 0.01V, connecting an impedance of 330 Ω in series, Reaching the target voltage in 5 seconds.

≥ 3.45V

6.Nominal discharge

1.74k Ω ,20 ± 2 ℃ , Constant discharge to 2.0V.

≥ 3400mAh

7.Rapid discharge

330 Ω ,20 ± 2 ℃ , Constant discharge to 2.0V.

≥ 2000mAh

8. Discharge at high temperature

Put battery in constant ambient temperature of 55 ± 2 ℃ for 16 hours, discharge at 620 Ω to 2.0V/cell.

≥ 1800mAh

9.Discharge at low temperature

Put battery in constant ambient temperature of -40 ± 2 ℃ for 16 hours, discharge at 620 Ω to 2.0V/cell

≥ 1500mAh

10.Charge

Prohibited

Prohibited

11.Over-discharge

Prohibited

Prohibited

12.Self discharge

Store the batteries at constant temperature of 20 ± 5 ℃ , Measure the nominal capacity yearly for 10 years.

≤ 1%