Brief: This device is 4 stages smart battery charger by 
Stage 1: initialization,when the charger power on then it start self-check and detect the battery correct connect. low output voltage without battery Fault LED is light, please CHECK THE POLARITY IS CORRECT.
Stage 2: Bulk charge,using the charger highest rated current for the type of battery in use until it reaches 80% capacity( LEDs 50% blinking ,100% OFF)
Stage 3: Absorption,the output voltage is limited to 7.3V(6V battery) or 14.5V(12V battery) while current declines as the battery charges to its full capacity without overheating( LEDs 50% ON ,100% blinking)
Stage 4: Float,At this stage,the battery is fully charged and the charger maintains the battery through pulse charging( LEDs 50% ON ,100% ON)
SPECIFICATION:
Input: 100-240VAC@50/60Hz 0.5rms
Output: DC 6.9V@ 1.5Amp
DC 13.8V@1.5Amp 
Limited voltage: 7.2~7.3V or 14.5~14.7V 
Float current: 300mA~400mA
Charging mode: Fully automatic
Suitable battery: 6V or 12V AGM GEL VRLA SLA WET
Charging Battery : 6-12Ah 
Maintaining Battery: 4-36Ah
Charger Size: 85X53X39mm
Safety: EN60950-1 EN60335
EMC: EN55022
Approved: CE RoHS
You'll Receive:
Battery Charger x3
DC Output Cable with Clamp Connectors x3
DC Output Cable with Ring Connectors x3
User Manual x3