Charging Mode For 12V Lithium-Ion Batteries (Charging Lio); Overview Of Applicable Voltage Ranges - Eltek MultiCharger 1500 Description And Operating Instructions

Operating modes/charging mode (permanent settings)

6.6 Charging mode for 12V lithium-ion batteries (Charging LIO)

This operating mode is for charging 12V lithium-ion Batteries. The MC1500 is ready to use after
it has been switched on by pressing control button 1 (on/off). This means that the output voltage
of the charger unit remains 0V until a battery has been connected to the charger's output.
When connecting a battery, its voltage is measured first. If the voltage of the connected battery
is not within the permissible range (see table in section 6.7 "Overview of applicable voltage
ranges"), the MC1500 does not switch on and the output voltage remains at 0V, and the LCD
displays an error message "Faulty battery".
If the battery is within an applicable 12V voltage range, the selects the corresponding output
voltage and charges the battery (see table in section 6.7). The LCD displays the message
"12V LIO charge".
Charging continues until the charging current falls below the limit of 2.5A. After that the MC1500
switches over to trickle charging without any post-charging time.
During trickle charging, the voltage is increased to charging-voltage level every 3 minutes to
avoid battery discharging due to low currents (high voltage stability of lithium-ion battery). The
charger unit will switch over to charging again if the current rises back above 2.5A during this
test. Hence, the charging cycle starts again.
If, during an adjustable time (default setting 12h), the charging current doesn't fall below 2.5A,
the MultiCharger 1500 is switched over to trickle charging and status message "Max. CHRG
time" is shown on the display.

6.7 Overview of applicable voltage ranges

The following table provides an overview of the applicable voltage ranges battery charging:
Voltage range
0V to 5V
5V to 7V
7V to 15V
15V to 17V
17V to 30V
>30V
2280073 Rev.1
MultiCharger Error
ready for use message
x
MultiCharger
at 14.0V/LIO
at 14.8V/Pb
x
x
x
x
MultiCharger
at 28.8V
x
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