Narada 313K Series Operation Manual - page 16
Narada Power Source Co., Ltd. 313K series 12V battery operation manual V1.5
16
4.2.2 Six‐month maintenance
1) Repeat quarterly maintenance
2) Measure and record each cell internal resistance to anomaly battery trends and detection of
individual cells deviation from normal cells.
4.2.3 Yearly maintenance
1) Repeat six‐month maintenance
2) Re‐tightening all connectors between cells
4.2.4 Two‐year maintenance
Do capacity test every two‐year, or choose discharge rate according to load. Test process as
following:
Charge battery fully, rest 5h‐24h at 25±2 , then discharge battery with current to end voltage
℃
shown in table 4‐1, record discharge voltage and time.
Table 4‐1 Discharge current and end voltage
Discharge
rate
Capacity
Discharge
current(A)
End voltage
(V/cell)
10HR
C
10
=1.00C
10
I10
1.80
8HR
C
8
=0.92C
10
1.15I
10
1.80
5HR
C
5
=0.89C
10
1.78 I
10
1.80
3HR
C
3
=0.75C
10
2.5 I
10
1.80
1HR
C
1
=0.55C
10
5.5 I
10
1.75
Standard Capacity temperature is base on 25℃, Convert the testing capacity(Cr) to standard
capacity(Ce) according to formula if test temperature is not 25℃
)
25
(
1
−
+
=
t
k
C
C
r
e
Wherein:t- ambient temperature during discharging
k-temperature coefficient:
10hhr rate discharge,k=0.006/℃
5~8hr rate discharge,k=0.007/℃
3hr rate discharge, k=0.008/℃
1hr rate discharge, k=0.01/℃
If standard capacity (Ce) is less than 80% rated capacity, please report manufacturer to analyze
the reasons for the reduction in capacity.
4.3 Replace battery
4.3.1 If standard capacity is less than 80% rated capacity (see clause 4.2.4 test method), user
should consider replacing battery.
In some special cycle mode, user can replace battery until lower capacity according to practical
situations.
4.3.2 Replace period
Storage battery is belong to consumables, have certain life cycle. Recommend replace the old
battery with the new one before battery design service life to ensure system safety.