Never clean storage batteries with benzene, thinner, gasoline or other organic
solvents or detergents. This can result in container or lid breakage or
cracking, becoming the cause of electrolyte leakage.
FCP type stationary lead acid batteries incorporate the control valve under
the vent plug. Neither the vent plug nor the control valve should ever be
removed, because this can result in performance degradation, shortened
service life, damage and other problems in the storage battery.
The work of moving or changing the installation location of storage batteries
should be consigned to the manufacturer or be performed under the guidance
of skilled personnel (experts). Having this work performed by unskilled workers
can result in damage to the batteries.
Allowing storage battery temperature to rise can shorten the service life, and in severe cases cause thermal
runaway. This can result in damage to the battery. Therefore, especially when installing batteries in cubicles or
other tight locations, the interior of the cubicle should be forcefully ventilated to prevent the temperature in the
vicinity of the battery from rising, while a ventilation port should be installed to provide ample heat discharge equal
to or above that of the conventional sealed type stationary lead acid battery (catalyzer plug type).
Correcting charge voltage in accordance with storage battery temperature is an effective means of curbing heat
generation.
Periodic inspections should be performed of voltage, visual appearance and other factors, with the bolts and nuts
also regularly tightened. Failure to perform regular inspections can cause damage to the storage battery or result in
ignited explosions.
5.2 Discharge
Discharge final voltage should be as shown in Table 3. Be sure that the storage battery terminal voltage does
not fall below that level. Storage batteries must not be left in a stage of discharge, but should be charged
immediately.
Characteristically, lead-acid batteries exhibit reduced output capacity (Ah) for discharge of a larger current.
Conversely, they exhibit greater output capacity (Ah) when discharge is made with a smaller current.
Therefore, if the battery is discharged at a high current under the low SOC condition, there is a possibility that
the batteries are over-discharged and the batteries life become short. Also, if the lower limit of SOC in
operation is set to less than 30%, it is possible that the some batteries are over-discharged by the difference of
battery performance during the long-term operation. We recommend to discharge the battery with the
discharge current equivalent to or smaller than that shown in Figure 5 for each SOC.
Example) The SOC is 100% when the battery is fully charged. After 10 hours of discharge with a discharge
current of 0.1 C10A, the SOC is brought down to 0%.
Caution:
Storage battery discharge current should be set in accordance with the maximum discharge current
values indicated in Table 4. Failure to do this can result in battery damage.
Table 3: Discharge Current Size and Discharge Final Voltage
Discharge Current (A)
Average Discharge Final Voltage Per Cell (V)
Under 0.1C
₁₀
or intermittent discharge
1.90
0.1C
₁₀
or current close to this
1.80
0.16C
₁₀
or current close to this
1.80
0.23C
₁₀
or current close to this
1.80
Electrolyte Leakage Danger
Explosion Danger