BAC2410BST Battery Charger User Manual
BAC2410BST Battery Charger Version 1.0 2019-05-25 Page 5 of 8
— Second stage is Absorption mode. After constant current charging, battery voltage grows to
absorption voltage soon. At this time battery shall keep constant voltage output, the charging
current decreases slowly, and battery terminal voltage keeps steadily at absorption voltage value.
During this process red indicator is light on always.
— Third stage is Float charging mode. After the above two stages, battery is basically fully charged.
Charger output voltage switches automatically to float voltage 27.6V and charging current reduces
to below float current 1.0A, and red indicator is extinguished, green indicator is illuminated.
Afterwards charging current only offsets battery
’s self-discharge. Long time charging doesn’t do
harm to battery. Charger can keep the status of fully charged for the battery and also make sure the
usage life of battery.
Fig. 2 Two-stage Charging Curve
Two-stage method is employed when charging is performed according to the battery charging
characteristics.
— First stage of charging mode is Constant Current, which means when battery terminal voltage is
below the pre-set value, it is always constant current charging.
— Second stage is Absorption mode. When battery terminal voltage is above the preset value,
charging current becomes smaller gradually as the terminal voltage increases. At this time it
becomes absorption charging mode. When charging current is below 1.0A, then battery terminal
voltage also gradually increases to the preset constant voltage value. Now the battery is basically
fully charged (red indicator is extinguished, and green indicator is illuminated). Afterwards charging
current only neutralize the battery self-discharge. Long time charging doesn
’t do harm to battery.
Charger can keep the status of fully charged for the battery and also make sure the usage life of
battery.
