Unless otherwise stated in this standard, the charging procedure for test purposes shall be carried out in an ambient temperature of 20oC±5oC, using the method declared by the manufacturer.

1.2 Discharge performance

1.2.1 Discharge performance at 20oC（rated capacity）

This test verifies the rated capacity of a cell.
Stage 1-The cell shall be charged in accordance with 1.1.

Stage 2-The cell shall be stored, in an ambient temperature of 20oC±5oC, for not less than 1 hand not more than 4 h.

Stage 3-The cell shall be discharged in an ambient temperature of 20oC±5oC, at a constant current of 0,2 ItA until the cell voltage is less than or equal to the specified end-of-discharge voltage.

Stage 4-The capacity （Ah）released during stage 3 shall be calculated at the end-of-discharge.

If the calculated capacity is lower than the rated capacity,then stages 1 to 4 are repeated,until the calculated capacity is greater than,or equal to the rated capacity. Five cycles are permitted.

1.2.2 Discharge performance at-20oC

This test determines the capacity of the cell at low temperatures.
Stage 1-The cell shall be charged in accordance with 1.1.

Stage 2-The cell shall be stored, in an ambient temperature of -20oC±2oC,for not less than 16 h and not more than 24 h.

Stage 3-The cell shall be stored, in an ambient temperature of -20oC±2oC,at a constant current of 2 ItA until the cell voltage is less than or equal to the specified end-of-discharge voltage.

Stage 4-The capacity （Ah）released,during stage 3,shall be calculated at the end-of-discharge.
The calculated capacity shall be expressed as a percentage of the rated capacity（%C5Ah）.

1.2.3 High rate discharge performance at 20oC
This test determines the capacity of a cell when discharged at a constant current of 1, 0 ItA.
This test is not required if the cell is not designed to be used at this rate.
Stage 1-The cell shall be charged in accordance with 1.1.

Stage 2-The cell shall be stored,in an ambient temperature of 20oC±5oC,for not less than 1 h and not more than 4 h .

Stage 3-The cell shall be discharged,in an ambient temperature of 20oC±5oC, at a constant current of 1, 0 ItA, until the cell voltage is less than or equal to the specified end-of-discharge voltage.

Stage 4-The capacity（Ah） released, during stage 3, shall be calculated at the end-of-discharge.

The calculated capacity shall be expressed as a percentage of the rated capacity （%C5 Ah）.

1.2 Charge (capacity) retention and recovery

This test determines the capacity(Ah) which a cell retains after storage for an extended period,and the recovered capacity of a recharged cell following the charge (capacity) retention test.
Stage 1-The cell shall be charged in accordance with 1.1.

Stage 2-The cell shall be stored, on open circuit, in an ambient temperature of 20oC±5oC,for 28 days.

Stage 3-The xell shall be discharged, in an ambient temperature of 20oC±5oC, at a constant current of 0,2 ItA, until the cell voltage is less than or equal to the specified end-of-discharge voltage.

Stage 4-The capacity (Ah) released during stag, 3 shall be calculated at the end-of-discharge.

The calculated capacity for the charge (capacity)retention shall be expressed as a percentage of the rated capacity (%C5 Ah).

Stage 5- The cell shall be charged, in accordance with 1.1,within 24 h from the discharge of stage 3.

Stage 6 - The cell shall be discharged, in an ambient temperature of 20oC±5oC, at a constant current of 0,2 ItA, until the cell voltage is less than or equal to the specified end-of-discharge voltage.

Stage 7- The capacity (Ah) released, during stage 6, shall be calculated at the end-of-discharge.

The calculated capacity for rhe charge (capacity) recovery shall be expressed as a percentage of the rated capacity (% C5 Ah).

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