BR1225 RAYOVAC, BR1225 Datasheet - Page 5

• Manufacturer Part Number: BR1225
• Description: LITHIUM BATTERY, 3V, COIN CELL
• Manufacturer: RAYOVAC

Specifications of BR1225

• Battery Size Code: Coin Cell
• Battery Capacity: 50mAh
• Battery Voltage: 3V
• Battery Technology: Lithium
• Battery Terminals: Pressure Contact
• External Diameter: 12.5mm
• External Height: 2.5mm
• Lead Free Status / RoHS Status: na

D. Internal Operating Resistance
Figure 5 below shows how the internal resistance
and voltage changes on a BR1225 cell as a percent
of discharge. Similar profiles with slightly different
values are observed with other cell sizes. The
typical initial 1KHz AC internal resistance for each
cell size is shown in Figure 6.
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
During Discharge
BR1225 Cell During 30KΩ Discharge
0
Typical Initial Internal Resistance
Cell Size
BR1225
BR1632
BR2032
BR2325
BR2335
Internal Resistance and CCV of
25
% Depth of Discharge
Closed Circuit Voltage
at 1 KHz AC
Internal Resistance
Figure 6
Figure 5
50
Internal Resistance
75
(Ohms)
85
34
25
16
21
100
250
200
150
100
50
0
75
5
E. System Internal Resistance Comparison
Rayovac BR Lithium coin cells provide more stable
internal resistance throughout discharge compared
to lithium manganese dioxide coin cells as shown
in Figure 7. This is due to the formation of conductive
carbon as a discharge by-product in the cell
cathode during discharge. This carbon prevents
a change in internal resistance until the active
components of the cell are consumed.
F. Operating & Storage Temperature Range
Rayovac BR Lithium coin cells and FB batteries
provide excellent performance over a wide range
of temperatures. The operating and storage
temperature ranges are as follows:
BR Lithium Coin Cells
FB Batteries
Internal Resistance During 30KΩ Discharge
100
80
60
40
20
0
0
Lithium Manganese
BR2032 Cell vs. CR2032 Cell
Dioxide (CR)
25
50
75
Capacity (mAh)
Figure 7
100
(-40°F to +185°F)
(-40°F to +212°F)
-40°C to +85°C
-40°C to +100°C
125
BR Lithium
Rayovac
150
175
200