Mercedes-Benz E-Class Sedan Operator's Manual page 329

When giving starting assistance, always
#
make sure that you only connect bat‐
tery terminals with identical polarity.
During starting assistance, you must
#
observe the described order for con‐
necting and disconnecting the jumper
cables.
Do not connect or disconnect the bat‐
#
tery clamps while the engine is running.
& WARNING Risk of explosion during
charging process and starting assistance
During the charging process and starting
assistance, the battery may release an explo‐
sive gas mixture.
Avoid fire, open flames, creating sparks
#
and smoking.
Make sure that there is sufficient venti‐
#
lation during the charging process and
during starting assistance.
Do not lean over a battery.
#
If the indicator/warning lamps in the instrument
cluster do not light up at low temperatures, it is
very likely that the discharged battery has fro‐
zen.
& 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 may be released.
Always thaw a frozen battery out first
#
before charging it or performing start‐
ing assistance.
* NOTE Shortening the service life of the
battery by charging the battery at low
temperatures
Charging the battery at very low tempera‐
tures may shorten the service life of the bat‐
tery and have a negative effect on starting.
Do not charge the battery at very low
#
temperatures.
Breakdown assistance 327
The service life of a battery that has been
thawed may be dramatically shortened.
It is recommended that you have a thawed bat‐
tery checked at a qualified specialist workshop.
All vehicles
* NOTE Damage caused by numerous or
extended attempts to start the engine
Numerous or extended attempts to start the
engine may damage the catalytic converter
due to non-combusted fuel.
Avoid numerous and extended attempts
#
to start the engine.
Observe the following points during starting
assistance and when charging the battery:
Only use undamaged jumper cables/charg‐
R
ing cables with a sufficient cross-section and
insulated terminal clamps.
Non-insulated parts of the terminal clamps
R
must not come into contact with other metal
parts while the jumper cable/charging cable
is connected to the battery/jump-start con‐
nection point.