Charging Exhaustive Discharge Batteries - Bosch BSL 2470 Original Instructions Manual

4.4

Charging exhaustive discharge batteries

In this operating mode, you can charge:
¶
very cold batteries
¶
12 V batteries that have an open-circuit voltage be-
tween 1 V and 8 V
¶
24 V batteries that have an open-circuit voltage
between 2 V and 16 V, in other words exhaustive
discharge batteries
!
In each case only one exhaustive discharge battery
may be charged. Switch off all consumers in the ve-
hicle when charging exhaustive discharge batteries.
1. Switch the battery charger off (Fig. 1, Pos. 9).
2. Unscrew the cell plugs on standard batteries before
starting the charging process.
3. Connect the crocodile clip-on terminals to the prop-
er battery terminals (Fig. 1, Pos. 1). The red-colored
clip goes to the positive terminal (+) and the black
one to the negative terminal (–).
4. Set the two-way switch for „cold and hot batteries"
to the correct position (Fig. 2, Pos. 6). Note that only
the battery temperature is to be evaluated.
5. Turn the potentiometer for setting the battery charg-
ing current (Fig. 2, Pos. 8) to the left-hand maximum
limit (lowest charging current).
6. Set the two-way switch (Fig. 2, Pos. 5) to the speci-
fied battery nominal voltage for the battery to be
charged.
7. Switch the battery charger on. After this the red LED
must light continuously (Fig. 2, Pos. 2) and the yel-
low LED flash slowly (Fig. 2, Pos. 4).
The battery is not yet being charged.
i
As long as the battery is in the under-voltage range,
the yellow LED will flash. The control for limiting the
battery charging current does not have any function
when the yellow LED flashes.
!
Before pressing the battery under-voltage button
check that the switch for selecting the battery nomi-
nal voltage has been set to the correct position
(12 V / 24 V).
8. Press the battery under-voltage button (Fig. 2,
Pos. 7). The yellow LED now flashes faster and the
battery is being charged. Only after the upper limit
of the battery under-voltage range has been exceed-
ed (yellow LED lights continuously) does the bat-
tery charging current come into effect through the
potentiometer.
Robert Bosch GmbH
Operation | BSL 2470 | 17
9. Use the potentiometer to then set the battery charg-
ing current to the required value.
!
When setting the battery charging current make sure
that the manufacturer's specifications are adhered to.
10. The battery is fully charged, when the green LED
lights and when the battery charging current
display indicates that only a small charging current
is being registered. Switch off the battery charger
once the charging process is over.
11. Disconnect the crocodile clips from the battery
(remove the black negative one first).
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