Narada Power Source Co., Ltd. REXC operation manual V1.2
14
operate at 35
℃
for long term, the life will be 10 years. Below is the formula:
L
25
＝
L
T
×2
（
T
－
25
）
/10
Notes
：
T is the actual ambient temperature;
L
T
is designed life at T ambient temperature
L
25
is designed life at 25
℃
ambient temperature
Ambient temperature elevating, also will accelerate the battery grids corrosion and the
battery water loss, thus will greatly reduce the battery life. So it is important to control
the ambient temperature. When heat is accumulated to a certain degree, it will damage
the battery, seriously will lead to thermal run away. If indoor temperature reaches too
high, please improve the ambient temperature by making room ventilated, etc. The
battery spacing cannot to be less than 10mm, at the same time regulating cell floating
and equalization voltage value according to handbook’s request.
3.3
Conductance, Resistance vs. Capacity
There is a certain corresponding relationship between conductance & resistance and
battery capacity. We suggest to test battery conductance and resistance data at different
stage with same type instruments from same factory. Conductance and resistance data
is only a reference to judge whether battery is good. These data cannot replace loading
test to judge whether battery is good. Narada recommend to test these data on the
surface or side of battery post. If there are several pairs of post, please test on nearest
pair of post.
Figure 3-3 Test location for conductance and resistance
4. Requirement for Charge
4.1
Periodically Equalization Charge
The battery needs an equalization charge after floating operation over three months,
or the voltage of at least two batteries are lower than 2.18V. The method of
equalization charge is constant current and limited voltage, as follows: charge with
constant current of 0.1C
10
A
～
0.15C
10
A till the average voltage reaches
equalization charge voltage of 2.30Vpc (25
℃
), then keep charging with
T
es
t l
ocat
ion f
o
r
conduct
an
ce and
res
ist
ance
