REPAIR PROCEDURES
TB24 Plus&26J Plus Maintenance Manual 6-37 © Jun 2022
NOTICE
It will not be covered by the warranty if the battery
attenuates or fails due to customer’s overuse (-
continued use after battery level less than 10%) or
battery out of charge for a long time (not timely
charged for 3 days or longer when the battery level
less than 10%).
Inspection
See the Inspect the Battery section in this manual.
Cleaning
1. Clean the top, terminals and connections of the
battery with a cloth or brush and mixed solution of
sodium bicarbonate and water. Do not let the
cleaning solution enter the battery.
2. Clean the top, terminals and connections with water
and wipe them dry with a cloth. Apply a thin layer of
petroleum jelly to the terminals or use terminal
protector.
3. Keep the area around the battery clean and dry.
Charging
See the Charging the Battery section of Operation
Manual.
Equalizing
Equalization is the deliberate process of overcharging
the flooded/wet battery after it has been fully charged.
Equalize the battery only when the specific gravity of
battery is low (less than 1.25) or the scope (0.030) of
the specific gravity is wide after the battery is fully
charged.
Note：
• Verify whether the battery is flooded/wet battery.
• To prevent battery damage, the battery must be
equalized within a maximum of 3 months storage
after delivery.
1. Inspect the electrolyte level height to ensure a
proper electrolyte level.
2. Verify all vent caps are properly secured to the
battery.
3. Set the charger to equalization mode.
4. Charge the battery in equalization mode.
The battery will bleed air in the equalization process
(forming bubbles).
5. Remove the vent cap every hour to measure the
gravity of all battery cells, if the gravity doesn’t
increase, stop the charging in equalization mode.
Storage
• Fully charge the battery before storage.
• The battery should be stored in cool and dry
environment (temperature 10℃~25℃, RH less than
90%), and charge the battery every 3 months using
the charger provided by the manufacturer.
• 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 6-24
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
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