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NICKEL METAL HYDRIDE HANDBOOK
AUGUST 2005
NICKEL METAL HYDRIDE BATTERIES: INDIVIDUAL DATA SHEET
This information is generally descriptive only and is not intended to make or imply any representation, guarantee or warranty with respect to any cells and batteries. Cell and battery designs/specifications are subject to
modification without notice. Contact Panasonic for the latest information.
Typical Discharge Characteristics
Typical Charge Characteristics
HHR450A Cylindrical L-fat A size (HR 18/67)
Dimensions (with Tube) (mm)
Specifications
* After charging at 0.1It for 16 hours, discharging at 0.2It.
** For reference only.
*** For rapid charge: use dT/dt charge termination method. Refer to the
Nickel Metal Hydride “Charge Methods” section for further details.
Battery performance and cycle life are strongly affected by how they
are used. In order to maximize battery safety, please consult Panasonic
when determining charge / discharge specs, warning label contents
and unit design.
0 20 40 60 80 100 120 140 160 180 200 22
0
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
Voltage (V)
0˚C
20˚C
45˚C
Charge Time (minutes)
Charge: 1500mA- V=10mV
012345
6
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
900mA(0.2 It)
Charge:
2000mA dT/dt=1.0
˚C
/min,20
˚C
Disharge Temperature:
20
˚C
Voltage (V)
Discharge Time (hours)
0 20 40 60 80 100 120 14
0
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
4500mA(1 It)
2000mA(0.44 It)
Charge:
2000mA dT/dt=1.0
˚C
/min,20
˚C
Disharge Temperature:
20
˚C
Voltage (V)
Discharge Time (minutes)
(
+
)
( )
67.0
+
-
0
1.5
18.2
+
-
0
0
.7
Note: [It] was previously expressed as [C]. [It] is an IEC standard expression
for the amount of charge or discharge current and is expressed as:
It(A) = Cn (Ah)/1h.
• [It] is the reference test current in ampres
• [Cn] is the rated capacity of the cell or battery in Ampere-hours.
n = the time base [hours] for which the rated capacity is declared
Nominal Voltage 1.2V
Discharge
Capacity*
Average**
Rated (Min.)
4500 mAh
4200 mAh
25mΩ
420mA (0.1It) x 16hrs.
2000mA dT/dt
Approx. Internal impedance
at 1000Hz at charged state.
Charge
Charge
Discharge
Storage
Standard
Rapid***
Standard
Rapid
Ambient
Temperature
˚
C
˚
F
0˚C to 45˚C
0˚C to 40˚C
-10˚C to 65˚C
-20˚C to 35˚C
-20˚C to 45˚C
-20˚C to 55˚C
32˚F to 113˚F
32˚F to 104˚F
14˚F to 149˚F
-4˚F to 95˚F
-4˚F to 113˚F
-4˚F to 131˚F
< 1 year
< 3 months
< 1 month
Diameter
Height
Approximate
Weight
mm inch
Grams
Ounces
18.2+0/-0.7
67.0+0/-1.5
0.72+0/-0.03
2.64+0/-0.06
60 2.12