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Figure 7
Table 1 Shelf life at various temperatures
Temperature
Life
Below 20
℃
(68
℉
)
21
℃
(70
℉
) to 30
℃
(86
℉
)
31
℃
(88
℉
) to 40
℃
(104
℉
)
41
℃
(106
℉
) to 50
℃
(122
℉
)
9 months
6 months
3 months
1.5 months
R
R
E
E
C
C
H
H
A
A
R
R
G
G
I
I
N
N
G
G
S
S
T
T
O
O
R
R
E
E
D
D
B
B
A
A
T
T
T
T
E
E
R
R
I
I
E
E
S
S
In general, to optimize performance and service life, it is recommended that
FULI
batteries which are to be stored for extended periods of time be given a supplementary charge, commonly
referred to as a “top charge ", periodically. Since any battery loses capacity through self discharge, it is recommended that, prior to putting the battery into service, a process called “top
charging “be applied to any battery which has been stored for a long period of time.
Excluding conditions in which storage temperatures have been abnormally high, top charging is recommended within the following parameters:
Battery Age
Top Charging Recommendations
Within 6 months after manufacture
4 to 6 hours at constant current of 0.1C Amps or 15
to 20 hours at constant voltage of 2.45Vpc
Within 12 months after manufacture
8-10 hours at constant current of 0.1C Amps or
20-24 hours at constant voltage of 2.45Vpc
In order to successfully top charge a battery stored for more than 12 months, the open circuit voltage must be checked to ensure that it
is higher than 2.0 volts per cell.
Therefore ALWAYS check the open circuit voltage FIRST. If the open circuit voltage of the battery is 2.0 Vpc or lower, please refer to us
prior to attempting to “Top Charge ".
Effect of Temperature on Battery Capacity
The nominal battery capacity is based on the temperature of 20
℃
. Above this temperature, the capacity increases marginally but it must be noted that the working battery should be kept
within the temperature design limitations of the product.
Below 25
℃
, the capacity decreases. This decrease in capacity becomes more prominent at temperatures below 0
℃
and in heavy discharge rates. Figure 7 below illustrates the situation
and the decrease in capacity with the decrease in operating temperature. Temperature must be taken into capacity design calculations in applications where the operating temperature of
