BR1225 RAYOVAC, BR1225 Datasheet - Page 7

LITHIUM BATTERY, 3V, COIN CELL

BR1225

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

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

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I. Charging Characteristics
Although any charging of BR Lithium cells is to be
avoided, some charging may occur even in a well
designed electrical circuit due to leakage current of
the protecting diodes. The diode used in a circuit
design with a BR Lithium cell should minimize
leakage to within 3% of the rated capacity of the
cell over the lifetime of the cell's use. Figure 9
below provides the maximum total charge
allowance for all cell sizes. Figure 10, which
illustrates these limits as they apply to the BR1225
& BR2325 cell sizes at various drain rates, follows.
Formula to calculate charge current:
I
Where: I
max
100
(nA) = 114.15 x c
10
.1
1
BR1225
BR1632
BR2032
BR2325
BR2335
.0001
Size
Cell
Maximum Total Charge Allowance
Maximum Total Charge Allowance
max
= Maximum allowable charge current in
t = Time on charge in years
Less than 3%
c = Maximum total charge capacity in
of Capacity
nanoAmperes (nA)
.001
t
mAh from table above
BR1225
BR2325
Charging Current (µA)
130 mAh
195 mAh
180 mAh
300 mAh
Capacity
50 mAh
Rated
Figure 10
Figure 9
.01
.1
More than 3%
1.50 mAh
3.90 mAh
5.85 mAh
5.40 mAh
9.00 mAh
Capacity
of Capacity
3% of
1
10
7
J. Short Circuit Recovery
In the process of wave soldering tabbed versions
of the BR Lithium batteries to circuit boards, a
temporary short will occur. Figure 11 below shows
the voltage recovery of a Rayovac BR2325 coin cell
after a 5 second short circuit which would typically
occur in the wave soldering process.
K. Leakage Resistance
The electrolyte in BR Lithium batteries is based on
an organic solvent instead of a corrosive alkaline
or acidic solution found in most conventional
batteries. This greatly improves the cell’s leakage
resistance and guards against the negative effects
caused by leakage.
L. Orientation
Since Rayovac batteries use solid active components,
the performance characteristics described are
obtained regardless of the installation position.
BR2325 Voltage Recovery after 5 Second Short
1
4
3
2
0
0
Original OCV
10 sec
Elapsed Time After 5 Second Short
20 sec
Figure 11
30 sec
10 min
8 hrs 16 hrs
24 hrs

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