discharge at C/5 rate to a 1.0V final voltage. Cycle life time. The useful life of a nickel-cadmium or nickel-metal hydride battery can be expressed either in number ...
Saft’s sealed nickel-cadmium and nickel-metal hydride cells are safe, maintenance free and can be installed and used in any position during charge, discharge and storage.
Cycle life VR series
Cycles 5000 3000 2000 1000 500 300 200 Depth of discharge at C/5
Cell-rating capacity method As per IEC Standard conditions, Saft’s nickel-cadmium and nickel-metal hydride cells capacity are rated as follows: • at 20˚C ±5˚C • charge 16 hours at C/10 • rest from 1 to 4 hours • discharge at C/5 rate to a 1.0V final voltage
30
40
50
60
70
80
90
100%
Voltage in discharge at +20˚C after charge 0.1 C x 16 hours at +20˚C VR Series
Voltage (volts) 1.3 1.2 1.1 1
1C
0.9
0.2C 0.1C
5C Available capacity (%C)
0.8 0
10
20
30
40
50
60
70
80
90
100
110
Cycle life time The useful life of a nickel-cadmium or nickel-metal hydride battery can be expressed either in number of cycles before end of life or in units of time. Experience and laboratory test data show that cycle life depends on depth of discharge and temperature. When performing a fast charge, cycle life is also a factor of the way end-of-charge detection is achieved.
Available capacity (%C5A) 100 80 60
0.02C5A 0.1C5A 0.2C5A
40
1C5A Discharge Temperature (˚C)
20 -40
-30
-20
-10
0
10
20
30
40
50
Available capacity from -40˚C to +50˚C for various discharge rates, after charge at +20˚C VR series
3459P SA CA.PORT.CELLS/BAT. A4
5/10/99
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Page 11
120 Available capacity (%C) 100 80
+20˚C
60
0˚C
-10˚C
40
-40˚C
20
-20˚C
-30˚C
Available capacity after charge 0.1 C x 16 hours at +20˚C VR series
Discharge characteristics
Charge retention at various temperatures VR series
The average discharge voltage depends on size and construction discharge current, discharge temperature and cycling history.
Discharge current (xC)
0 0
1
2
3
4
5
100 Available capacity (%C)
90 80 70
+20˚C
60 50
+40˚C
30
+50˚C
20 10 0
Period of storage (days) 0
10
20
30
40
50
Charge retention
60
100 Available capacity (%C)
Charge retention between +20˚C and +60˚C VT series
+20˚C
80
+30˚C
60
+40˚C
40
+50˚C
20 0
Capacity, measured in terms of ampere-hours or milliampere-hours, depends on several factors, i.e., cell size, cell design and construction, charge effectiveness, temperature, open circuit time, discharge rate, final voltage and cell history.
For detailed information, refer to the specific data shown later in this catalogue.
+30˚C
40
Discharge characteristics are capacity and voltage.
+60˚C Period of storage (days) 0
10
20
30
40
50
60
The charge retention curves shown here are based on storage at various temperatures. The self-discharge rate is a function of temperature and cell technology. Storage at higher temperatures will reduce charge retention.
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