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Electrical & Temp. Performance
Pulse discharge characteristics
ENATA Lithium batteries have excellent pulse
R
load characteristics, for example for the
ransmission of radio signals by remote controls.
t
The following diagrams show the voltage
characteristics at pulse loads of 10, 20, and
load Impulsions 100ms, l= 10 mA at 23°C CR2032MFR
.5
3
3
(V)
.5
2
2
U
2
1.5
1
0 1 2 3 4 5 6 7 8 9 10
Time (s)
load Impulsions 100ms, l= 50 mA at 23°C CR2032MFR
.5
3
3
(V)
2.5
2
U
2
1.5
1
0 1 2 3 4 5 6 7 8 9 10
Time (s)
50 mA during 100 ms, pulse cycle 1 second, at
mbient temperature. The voltage drop under load
a
is evident as well as the voltage recovery to
lmost the original level after a very short time.
a
Please contact Renata for further details.
load Impulsions 100ms, l= 20 mA at 23°C CR2032MFR
3.5
3
(V)
.5
2
2
U
2
1.5
1
0 1 2 3 4 5 6 7 8 9 10
Time (s)
Inverse current
Lithium primary batteries are not rechargeable.
Therefore, if there is a possibility of electric
current flowing from the main power source to the
battery, the circuit must include two suitable
blocking diodes in series or one blocking diode
and one protective resistor in series (refer to
drawing in chapter SAFETY GUIDELINES) Use a
silicium diode of small inverse current to prevent
charging.
The total amount of recharge energy
due to leakage by the blocking diodes should not
exceed 1% of the battery's nominal capacity
during its total service life. A higher input of recharge energy may harm the battery or reduce its
performance.
Example: A CR2450N battery with a nominal
capacity of 540 mAh is expected to supply power
for 5 years. The amount of tolerable re-charge
1)
540 mAh * 1% = 5.4 mAh
5.4 mAh / (5 years * 365 days * 24 hours) = 0.123 µA
energy is 5.4 mAh, corresponding to an inverse
1)
current of 0.123 µA for the total service life
.
Consequently, a blocking diode with an inverse
current not greater than 0.1 µA should be
selected. Please note that the inverse current of
blocking diodes varies with temperature.
Short circuits
When lithium batteries are short-circuited, it takes
time for the battery voltage to recover, even in
case of slight short-circuits. If electrical characteristics are measured while the battery is recovering, the battery may appear to be defective, but is
not. Short-circuiting leads to deterioration of the
cell capacity. Short-circuiting of batteries must
therefore be avoided, except for wave or dip
soldering. Use an instrument with a high input
impedance (minimum 10 M
) for measuring
open circuit voltage.
the swiss power source
39
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