Page 1183 - Workshop Manual - Aumark (BJ1051)

53-7
Battery-Battery

4. Preparation before charging
(a). Check if the electrolyte or pure water is accord to the specification.
(b). Open the blow off cock on the battery.
(c). Fill electrolyte or water to the highest mark.
5. Connection for charging.

(a). The positive pole of battery charger is connected with the positive pole of battery, and
negative pole is connected with the negative pole of battery. Do not connect them mixed.
(b). For most of the batteries, it can be decided by the power of battery charger, but the
connection must firm.
6. Charge mode

There are three charging modes: constant current charge, constant voltage charge and quick
charge.
(a). Constant current charge
For constant current charge, it includes initial charging, supplementary charging, general
charging and equilibrium charging.
• Initial charging is the first time charging for charged drained battery before using. After
charged drained battery is filled with electrolyte and placed stillness for 1-6 hours, and
start to charge when the temperature decreases to below 35 .℃
• The charging current normally is 0.07C20A （that is 0.07 × 20 = 1.4 ampere current）for
initial charging, and decrease the current to its half and continue the charging when the
cell voltage reaches to 2.4V.
• Supplementary charging is for the dry charged battery with poor dry charging
performance and stored for a long time, or for the battery not used for about one month
after it is charged after filling acid. Current of supplementary charging is 0.1C20A, and
charging time is about 5 hours or it is decided by the time of storage.
• General charging means the charges after initial charging. The first stage of general charging
adopts 0.1C20A and charges 8-12 hours, and then decreases the current to its half and charge
about 10 hours when the cell voltage reaches to 2.4V. Charged electrical quantity normally is
1.5 times of discharged electrical quantity, or 1.3-1.5 times of rated capacity.
• Equilibrium charging means charge the battery using general charging method to full and 53
then charge it again by 0.035C20A current. Stop charging for 1 hour when temperature
increase and air bubbles emit evenly; repeat this process 3-5 times. Finish the charging
when one battery generates a great deal of bubbles, and voltage and density of
electrolyte does not change.
(b). Constant voltage charge
Constant voltage charge means charge the battery at constant voltage. At the beginning the current
is bigger and then it decreases gradually; voltage is normally around 2.3-2.4V for constant voltage
charge; for this kind of charging, the bubbles generated is less and water consumed is less, so
constant voltage charge is normally used for maintenance free seal lead-acid battery.
(c). Quick charge
Quick charge adopts big current and impulse charging with short time discharge intermittent
charging method. Normally for quick charge, it uses 1-2 times of C20A big current for
charge. Quick charge adopts special made quick battery charger.
7. Indication to judge if the battery is charged fully
(a). There is great deal of air bubbles generated inside of battery cell.
(b). The voltage of battery cell is around 2.6-2.8V, and it does not change more than 2 hours.
(c). Specific gravity of electrolyte reaches to 1.280 ± 0.01 g / cm3 （25 ℃），and it does not
change more than 2 hours.

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