VL0612/VL1212_v2
VELLEMAN
4
ATTENTION: Your battery charging system has spark-free circuitry! The clips will not spark when making contact
with each other. It will also not produce any voltage (when turned on) until it senses at least 3V from the battery. It
must be connected to battery in order to start working.
The clip terminals must be connected to the battery with correct polarity to initiate output voltage. In other words,
when you plug an AC power cord into a 230V power source, the output clips will not spark when making contact with
each other.
The output clips must be connected to a battery to produce an output voltage.
If the charger is hooked up backwards, the red light will continue to flash which indicates that no charging has been
initiated. The clips must be properly connected (polarity!) to start the charger (red to positive (+ to +) and black to
negative (- to -)).
Never turn the device on and off within a few seconds. If this should happen, unplug the battery charger, wait a few
minutes and then reconnect it to restart the charging cycle.
c. Charging time
(BATTERY CAPACITY) / (CHARGING CURRENT) = HOURS
or
(AMP HOURS) / AMPS = HOURS
Suppose you have a 15 Amp/Hour battery, which is a fairly typical size for an automotive engine start type battery.
Let's say you have a 1.25 Amp charger. A good charger will deliver close to 1.25Amp for as long as it takes to
completely recharge the battery to its full capacity. It is possible to calculate the charging time by dividing the two
values:
e.g. 15 AMP HOURS divided by 1.25 AMPS = 12 HOURS
Some large capacity batteries may take up to 24 hours or even days to fully charge.
d. Dead battery
If your battery is completely dead (under 3V), the battery charger's circuitry will not start due to its internal safety
circuit. The charger's internal safety circuit must detect more than 3V for the charger to be turned on. Otherwise, the
charger is inoperable. In this case, both the red and the green indicator light are flashing at the same time, which
means that the charge cycle has not been initiated. In order to be able to charge a completely dead battery, just fool
the charger's circuitry by momentarily connecting the battery to a known good battery. This will trick the charger and
start the charge cycle.
Note: Most 12V lead-acid batteries are likely to be defective if their voltage is below 9V.
e. 72-hour safety timer
A 72-hour safety timer will start working once the battery charger is turned on to protect the battery from
overcharging. If the battery voltage does not reach the absorption level within 72 hours, the charger will automatically
switch to float mode. In this case, both the green and red lights will burn steadily.
However, with marginal or defective batteries, the battery charging system will stop the charging process to prevent
the marginal battery from overcharging.
If this happens, the green light will burn steadily whereas the red light will be flashing. Please have the battery
checked.
