© Oct 2020 6-36 AB18EJ&18HJ Maintenance Manual
REPAIR PROCEDURES
• Measure the specific gravity every hour; stop
charging in equalization mode when the specific
gravity does not increase.
STORAGE
• Charge the battery before storage.
• Store the battery in a shady, cool and dry place that
is free of the influence of the weather.
• Disconnect the power-off plug to prevent potential
parasitic loading, which may cause electrical
leakage of the battery.
• The battery will self-discharge gradually during
storage. Monitor the specific gravity or the voltage
every 4～6 weeks. The comparison of the charging
state with specific gravity and open-circuit voltage is
shown in the following table.
Table 6-11
Percentage Charging
（%）
Specific Gravity
Open-Circuit Voltage (V)
Battery Cell
6V 12V
100 1.277 2.122 6.37 12.73
90 1.258 2.103 6.31 12.62
80 1.238 2.083 6.25 12.50
70 1.217 2.062 6.19 12.37
60 1.195 2.040 6.12 12.24
50 1.172 2.017 6.05 12.10
40 1.148 1.993 5.98 11.96
30 1.124 1.969 5.91 11.81
20 1.098 1.943 5.83 11.66
10 1.073 1.918 5.75 11.51
• Recharge the battery in quick mode when the
battery level is 70% or lower.
• Recharge the battery before use after removing it
from storage.
• Storage in hot environments (above 32°C [90°F]):
During storage, do not expose the battery directly to
the heat source. The self-discharge process will
accelerate in warmer temperatures. If storing the
battery in hot temperatures or during hot weathe
monitor the specific gravity or the voltage more
frequently (about every 2 - 4 weeks).
• Storage in cold environments (below 0°C [32°F]):
During storage, do not store the battery in a place
with an estimated temperature reaching the freezing
point; if the battery has not been fully charged, it
may freeze in cold temperatures. If storing the
battery in cold temperatures or during cold weather,
fully charge the battery. This point is very
important.
TROUBLESHOOTING
Follow the battery testing guidelines to determine if the
battery needs to be replaced.
Voltage Test When Charging
1. Disconnect and reconnect the DC plug to restart the
charger.
2. Record the current in the last half an hour (if
possible) and measure the voltage of the battery
rack when charging.
3. At the end of charging, check if the current is lower
than 5A and the voltage of the battery rack is higher
than the following values:
56V for 48V system; 28V for 24V system; 14V for
12V system or 7V for 6V system; if so, proceed to
the next step. Otherwise, inspect whether the
output of the charger is correct and recharge the
battery as required. If the voltage of the battery rack
is still very low, a problem may exist with the
battery.
4. Measure the voltage of each individual battery
when the battery is in the charging state. If the
voltage of any battery is lower than the following
values, a problem could exist with the battery:
7V for 6V battery, the voltage difference between
the battery and any other batteries in the battery
rack is larger than 0.5V; 14V for 12V battery, the
voltage difference between the battery and any
other batteries in the battery rack is larger than
1.0V.
Test of Specific Gravity
1. Fill and drain the specific gravity hydrometer 2～3
times. Then, obtain a sample from the battery.
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