7. Discharge Characteristic
Discharge
c
haracteristic curves are as right:
Discharge Capacity vs Temperature
Storage
Time
(
Month
)
Charge Voltage
(
V
/
Cell
)
Maximum Charge Current
(
A
)
Charge Time
(
Hr
)
2.43
2.43
0.3C
10
0.3C
10
24
36
Storage
Time
vs
Charge
Voltage
and
Charge
T
ime
3~6
6~12
Temperature vs Capacity Curve
1 2 0
1 1 0
1 0 0
8 0
6 0
4 0
0
- 4 0
- 3 0
- 2 0
- 1 0
- 0
1 0
2 0
3 0
4 0
5 0
Temperature
（℃ ）
E
ff
e
c
ti
v
e C
a
p
a
c
it
y (
%
)
10
Hr rate
discharge
：
K
=0.006/℃；5
Hr rate
discharge
：
K
=0.007/℃
3
Hr rate
discharge
：
K
=0.008/℃；1
Hr rate
discharge
：
K
=0.010/℃
C25
Discharge
capacity
at
25
(
AH
)
Ct Discharge capacity
at
t
(
AH
)
t
Environment
temperature
during
discharge
(
)
K Temperature compensation
coefficient
Temperature vs Capacity Curve
7
According to the difference of discharge rate,
the cutoff voltage is also different. Larger
discharge current sets lower cutoff voltage;
reversely, smaller discharge current sets
higher cutoff voltage. Normally the battery
cutoff voltage of single cell discharge is set at
1.8 0 – 1.60V. The discharge capacity
decreases with the increase of discharge
current; the discharge capacity increases with
the decrease of discharge current.
1C A
10
0. 55 C A
0. 25 C A
10
10
1
2
3
5
1 0
2 0 3 0
6 0
2
3
5
1 0
2 0
2 . 1 0
2 . 0 5
2 . 0 0
1 . 9 5
1 . 9 0
1 . 8 5
1 . 8 0
1 . 7 5
1 . 7 0
1 . 6 5
1 . 6 0
1 . 5 5
1 . 5 0
Mi n
Hr
Note:C =10Hr nominal capacity
1 0
Discharge Characteristic Curves
T
e
rm
ia
l Vo
lt
a
g
e (
V
)
0.1C A
1 0
0.165C A
1 0
Battery discharge capacity is related with temperature. Lower temperature, lower discharge
capacity; higher temperature, higher discharge capacity. But over high temperature will seriously
damage the battery lifetime. The best working temperature for battery is
20- 25℃
. The discharge
capacity at a certain temperature Ct vs the discharge capacity at
25℃
C25 have below relationship:
