REPAIR PROCEDURES
AB18EJ&18HJ Maintenance Manual 6-37 © Oct 2020
2. Measure the specific gravity of all battery cells.
3. When the temperature is above 27°C (80°F), add
0.004 to correct the reading of the specific gravity
every 5°C (40°F) higher. When the temperature is
below 27°C (80°F), deduct 0.004 to correct the
reading of the specific gravity every 5°C (40°F)
lower.
4. If the specific gravity of each battery in the battery
rack is lower than 1.250, the battery rack may not
be sufficiently charged. Recharge the battery rack.
5. If the specific gravity difference between any battery
in the battery rack is over 0.050, equalize this
battery rack.
6. The battery in the battery rack may have a problem
if the difference still exists.
Open-Circuit Voltage Test (Rarely Used)
1. To obtain an accurate voltage reading, do not use
the battery for at least 6 hours, but, it is best not to
use the battery for 24 hours.
2. Measure the voltage of each individual battery.
3. Equalize the battery rack if the voltage of any
battery is 0.3V higher than that of other batteries in
the battery rack.
4. Re-measure the voltage of each individual battery.
5. The battery may have a problem if the voltage of
any battery is 0.3V higher than that of other
batteries in the battery rack.
There are other battery tests to evaluate battery
performance, such as discharge tests, that are not
described here.
HIGH-FREQUENCY BATTERY CHARGER
Relevant Technical Parameters:
• Input voltage: AC100～240V
• Output voltage: 24V
Precautions:
• Low-input voltage protection: The battery charger
will shut down when the input AC voltage is lower
than 85V. It will automatically resume charging
when the voltage becomes normal.
• Reverse-polarity protection: In case of the reverse
polarity of the battery, the battery charger will
terminate the connection between the internal circuit
and the battery to avoid charging and damaging the
battery.
• Output short-circuit protection: When there is an
accidental output short circuit of the battery charger,
the battery charger will shut down the output
automatically to troubleshoot the problem. Then, the
battery charger will restart after a delay of 10
seconds.
• Charging indication: The yellow indicator lamp will
illuminate when charging, the green indicator lamp
will illuminate after charging and the red indicator
lamp will illuminate if the battery has a problem.
• Charging brake: All functions of the machine will not
operate when charging.
Use and Care of Lead-acid Battery
(maintenance-free)
The use and care requirements for lead-acid
maintenance-free batteries are as follows:
PREPARATION
• Before checking the fault, the operator must wear
safety equipment, including insulating gloves,
helmets and other necessary safety supplies and
multimeters.
• Inspect the battery system cabinet for problems
such as battery deformation, damage of the positive
and negative terminals, etc.
• Check and confirm the fault description and analyze
the cause.
CHARGING
• Do not use an external charger.
• Charge using the correct AC input voltage indicated
on the decal.
• Make sure the battery is connected before charging.
• Connect the battery charger to a grounded AC
circuit.
• Charge the battery every time after using.
CARE
• While wearing proper hand and face protection,
wipe the top and sides of the battery.
• Do not rinse or spray the battery pack with a water
hose.
• Be sure the cable connector is tight on the terminal.
• Do not leave the battery in a discharged state during
storage, as it will shorten the service life.
CAUTIONS
• Because there is a risk of high voltage, do not touch
non-insulated terminals or connectors.
• The battery terminal and related accessories
contain lead and lead components. Wash your
hands after handling them.
Use and Care of Lithium Battery
The requirements for the use and care of lithium
batteries are as follows:
PREPARATION
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