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CHARACTERISTICS - CONTINUED

e) Open circuit voltage vs. residual capacity Residual capacity of the battery can be roughly estimated by measuring the open circuit voltage as shown in the Figure.

Open circuit voltage vs. Residual capacity 25C

Cycle life vs. Depth of discharge

(Test condition) Discharge : 0.25 CA corresponding resistance Cut-off voltage: Discharge depth 100% only 1.75V/cell Charge : 14.7 V constant-voltage control Maximum current: 0.4 CA 6 hours Temperature : 25˚C

7.00

14.0

120

(Temperature: 25˚C)

100

Open circuit voltage (6V battery)

Open circuit voltage (12V battery)

Capacity (%)

11.0

Constant-voltage cycle life characteristics

10.5

10.0

(LC-SA122R3AU)

100

6.00

5.75

12.0

11.5

5.50

5.25

5.00

0

20

6.50

6.25

13.0

12.5

80

40 60 Residual capacity (%)

80

6.75

0

13.5

60

40

20

1400

100%

50%

(3h discharge) (1.5h discharge)

Depth of discharge 30% (0.9h discharge)

200

400 600 800 1000 1200 Charge/discharge cycle (number of cycles)

  • Temperature conditions Recommended temperature ranges for charging, discharging and storing the battery are tabulated below.

Charge

0C ~ 40C

Discharge

-15 C ~ 50C

Storage

-15 C ~ 40C

100

Capacity (%)

50

(Test condition) Discharge : 0.4 CA corresponding resistance Cut-off voltage: 10.5V Charge : 14.7V constant-voltage control Maximum current: 0.92A 6 hours Temperature : 25˚C

0

  • Battery life

    • a)

      Cycle life

Cycle life (number of cycles) of the battery is dependent on the depth of discharge in each cycle. The deeper the discharge is, the shorter the cycle life (smaller number of cycles), providing the same discharge current. The cycle life (number of cycles) of the battery is also related to such factors as the type of the battery, charge method, ambient temperature, and rest period between charge and discharge. Typical cycle-life characteristics of the battery by different charge/discharge conditions are shown by the below figures. This data is typical and tested at a well-equipped laboratory. Cycle times are different for each battery model. Cycle times are also different from this data when using batteries under real conditions.

0

100 200 300 Charge/discharge cycle (number of cycles)

Rapid-charge cycle life characteristics (LC-SA122R3AU)

100

Capacity (%)

50

0

(Test condition) Discharge : 0.4 CA corresponding resistance Cut-off voltage: 10.5V Charge : V-taper control Maximum current: 1.6A 90 minutes Temperature : 25˚C

0

100

200

300

400

500

Charge/discharge cycle (number of cycles)

400

600

Sealed Lead-Acid Handbook, Page 18

January 2000

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