1.4 Charge (capacity) recovery after storage

This test determines the capacity a cell recovers after storage for a specified period following subsequent charge.

Stage 1-The cell shall be charged in accordance with 1.1.

Stage 2-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 3-The cell shall be stored, in open circuit, in an ambient temperature of 40oC±2oC, for 90 days.

Stage 4-The cell shall be charged, in an ambient temperature of 20oC±5oC, in accordance with the method declared by the manufacturer.

Stage 5-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 6- The capacity (Ah) released, during stage 5, shall be calculated at the end-of-discharge.

The calculated capacity for the charge (capacity) recovety shall be expressed as a percentage of the rated capacity (% C5Ah).

If the calculated capacity is lower than the required percentage of rated capacity, then stages 4 and 5 are repeated until the requirement is met. Five cycles are permitted.

1.5 Endurance in cycies

This test determines the number of chatge/discharge cycles which a cell can endure before its useful capacity has been depleted.

Unless otherwise agreed between the supplier and the purchaser, the following endurance-in-cycles test shall be conducted.

Stage 1-The cell shall be charged in accordance with 1.1.

Stage 2-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 3-The cell shall be discharged, in an ambient temperature of 20oC±5oC, in accordance with the method declared by the manufacturer. The cell may be stored between charge and discharge and/or discharge and charge for up to 1 h.

Stage 4-The cell shall be continuously discharged and charged as per stages 2 and 3 until the discharged capacity is less than 60 % of the rated capacity.

Stage 5-The result of this test shall be the number of times stages 2 and 3 were repeated (i.e. the cycle number) before the capacity (Ah), released during stage 2, at the end-of-discharge, becones less than 60 % of the rated capacity (60 %C5 Ah).

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