BAC4812-KP BATTERY CHARGER USER MANUAL
BAC4812-KP Battery Charger Version 1.2 2017-11-10 Page 4 of 7
1. OVERVIEW
Fit with up-to-date power supply device, float charger BAC4812-KP is specially designed for meet the
charging characteristics of the lead-acid engine starter batteries and can be used for long-term float
charging of 12V lead-acid batteries.
2. PERFORMANCE AND CHARACTERISTICS
1) Switch power supply structure, wide input alternating voltage range, small size, light weight, high
efficiency rate;
2) Automatic two-stage charging process (first constant current, then constant voltage) carried out
according to storage battery charging characteristics to prevent overcharging and significantly
prolong battery lifetime;
3) Built-in current protective circuit for short-circuit protection and reverse connection protection;
4) Both charging voltage and current value can be regulated by potentiometer on the spot;
5) Suitable for 12V storage battery and the rated current is 3A;
6) LED display: Power indication (Green light) and charging indication (Red light).
3. CHARGING PRINCIPLE
Charging Principle
Charging is performed according to the battery charging characteristics using two-stage method.
Charging type is „constant current type‟ which means that when the battery terminal voltage falls below
the pre-set value, charging current will be constant; when the battery terminal voltage exceeds the
pre-set value, charging current will decrease with the rising of terminal voltage until the pre-set current
value is reached; then Chargers automatically return to float mode. As soon as charging current value
falls below 0.5A and the constant voltage value is reached, the battery is basically charged (charging
indicator will extinguish). After that charging current will only neutralize the battery self discharge. Even
long-term charging cannot harm the battery, as charger can keep the battery fully charged and so
guarantee long lifetime of the battery.
