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Charging the battery
& WARNING Risk of explosion from a fro‐
zen battery
A discharged battery may freeze at tempera‐
tures slightly above or below freezing point.
During starting assistance or battery charg‐
ing, battery gas can be released.
Always allow a battery to thaw before
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charging it or performing starting assis‐
tance.
If the warning and indicator lamps do not light up
in the instrument cluster at temperatures around
or below freezing, it is highly probable that the
discharged battery has frozen. In this case, do
not provide starting assistance or charge the bat‐
tery.
The service life of a battery that has been thawed
may be dramatically shortened.
The starting characteristics may be impaired,
especially at low temperatures.
Have a thawed battery checked at a qualified
specialist workshop.
Use a commercially available charger to charge
the battery. Note the correct charging voltage. Do
not charge new batteries with rapid charging.
When using rapid charging on used batteries, the
charging current must not exceed a maximum of
75% of the battery capacity. Otherwise, the bat‐
tery will be damaged.
For new batteries, the charging current must not
exceed 10% of the battery capacity. A higher
charging current can damage the battery.
Charge the batteries at an ambient temperature
over 0 °C. The optimal ambient temperature is
between 10 °C and 25 °C.
Remove the batteries.
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Unscrew the battery cell caps.
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Check the battery fluid level.
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Charge the batteries separately.
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Connect and switch on the charger. See the
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charger's operating instructions.
If the batteries are charged, deactivate the
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charger and screw the cell caps onto the bat‐
teries.
Fit the batteries.
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%
After charging/replacing the batteries, the
battery charge level calculated may not be
correct. It takes approximately three days
Maintenance and care 335
while the vehicle is in operation for the teach-
in process to be completed. The following
event window displays are only correct once
the teach-in process has been completed:
Energy-saving mode active
R
Battery charge level too low Start engine.
R
Checking the battery fluid level
Tap water reduces the electrical power of the bat‐
teries. Only top up with distilled or de-ionised
water.
Do not use a metal funnel when topping up. The
metal funnel could cause a short circuit and the
batteries may be damaged.
Batteries in the chassis, one beside the other
(example: semitrailer truck)
Observe the safety notes on handling batteries.
Check the battery fluid level regularly, as
#
required by the vehicle operating conditions,
and at least once a year.
Remove the battery box cover.
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Vehicles with batteries fitted one above the
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other: remove the batteries.
Unscrew cell caps 2.
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Check the battery fluid level. The battery fluid
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must reach marker bar
1
cell.
Top up with distilled/de-ionised water.
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Refit cell caps 2.
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Vehicles with batteries fitted one above the
#
other: fit the batteries.
Replace the battery box cover.
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in each battery
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